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The role of domain knowledge in a large scale Data Mining project

The role of domain knowledge in a large scale Data Mining project
The role of domain knowledge in a large scale Data Mining project

The role of domain knowledge in a large scale Data

Mining project

Ioannis Kopanas, Nikolaos M. Avouris, Sophia Daskalaki

University of Patras, 26500 Rio Patras, Greece

(ikop@ee.upatras.gr, N.Avouris@ee.upatras.gr, sdask@upatras.gr)* Abstract. Data Mining techniques have been applied in many application areas.

A Data Mining project has been often described as a process of automatic dis-

covery of new knowledge from large amounts of data. However the role of the

domain knowledge in this process and the forms that this can take, is an issue

that has been given little attention so far. Based on our experience with a large

scale Data Mining industrial project we present in this paper an outline of the

role of domain knowledge in the various phases of the process. This project has

led to the development of a decision support expert system for a major Tele-

communications Operator. The data mining process is described in the paper as

a continuous interaction between explicit domain knowledge, and knowledge

that is discovered through the use of data mining algorithms. The role of the

domain experts and data mining experts in this process is discussed. Examples

from our case study are also provided.

1 Introduction

Knowledge discovery in large amounts of data (KDD), often referred as data min-ing, has been an area of active research and great advances during the last years. While many researchers consider KDD as a new field, many others identify in this field an evolution and transformation of the applied AI sector of expert systems or knowledge-based systems. Many ideas and techniques that have emerged from the realm of knowledge-based systems in the past are applicable in knowledge discovery projects. There are however considerable differences between the traditional knowl-edge-based systems and knowledge discovery approaches. The fact that today large amounts of data exist in most domains and that knowledge can be induced from these data using appropriate algorithms, brings in prominence the KDD techniques and facilitates the building of knowledge-based systems. According to Langley and Simon [1] data mining can provide increasing levels of automation in the knowledge engi-*I. Kopanas, N.M. Avouris, S. Daskalaki, The role of knowledge modeling in a large scale Data Mining project, in I.P Vlahavas, C.D. Spyropoulos (eds), Methods and Applications of Artificial Intelligence, Lecture Notes in AI, LNAI no. 2308, pp. 288-299, Springer-Verlag, Berlin, 2002.

neering process, replacing much time-consuming human activity with automatic tech-niques that improve accuracy or efficiency by discovering and exploiting regularities in stored data. However the claim that data mining approaches eventually will auto-mate the process and lead to discovery of knowledge from data with little intervention or support of domain experts and domain knowledge is not always true.

The role of the domain experts in KDD projects has been given little attention so far. In contrary to old knowledge-based systems approaches where the key roles were those of the domain expert and the knowledge engineer, today there have been more disciplines involved that seem to play key roles (e.g. data base experts, data analysts, data warehouse developers etc.) with the consequence the domain experts to receive less prominence. Yet, as admitted in Brachman &Anand [2], the domain knowledge should lead the KDD process. Various researchers have made suggestions on the role of domain knowledge in KDD. Domingos [3] suggests use of domain knowledge as the most promising approach for constraining knowledge discovery and for avoiding the well-known problem of data overfitting by the discovered models. Yoon et al. [4], referring to the domain knowledge to be used in this context, propose the following classification: inter-field knowledge, which describes relationship among attributes, category domain knowledge that represents useful categories for the domains of the attributes and correlation domain knowledge that suggests correlations among attrib-utes. In a similar manner Anand et al. [5] identify the following forms of domain knowledge: attribute relationship rules, hierarchical generalization trees and con-straints. An example of the latter is the specification of degrees of confidence in the different sources of evidence. These approaches can be considered special cases of the ongoing research activity in knowledge modeling, ontologies and model-based knowl-edge acquisition, see for instance [6], [7], with special emphasis in cases of data-mining driven knowledge acquisition.

However these studies concentrate in the use of domain knowledge in the main phase of data mining, as discussed in the next section, while the role of domain knowledge in other phases of the knowledge discovery process is not covered. In this paper we attempt to explore our experience with a large-scale data-mining project, to identify the role of the domain knowledge in the various phases of the process. Through this presentation we try to demonstrate that a typical KDD project is mostly a multi-stage knowledge modelling experiment in which domain experts play a role as crucial as in any knowledge-based system building exercise.

2 Identification of key roles and key phases of a KDD project According to Langley and Simon [1] the following five stages are observed in the development of a knowledge-based system using inductive techniques: (a) problem formulation, (b) determination of the representation for both training data and knowl-edge to be learned, (c) collection of training data and knowledge induction, (d) evaluation of learned knowledge, (e) fielding of the knowledge base. In Fayyad et al.

[8] the process of KDD is described through the following nine steps: (a) Defining the goal of the problem, (b) Creating a target dataset, (c) Data cleaning and pre-

processing, (d) Data transformation, e.g. reduction and projection in order to obtain secondary features, (e) matching the goals of the project to appropriate data mining method (e.g. clustering, classification etc.), (f) Choosing the data mining algorithm to be used, (g) Data Mining, (h) Interpretation of identified patterns, (i) Using discov-ered knowledge. By comparing the two processes one should notice the emphasis of the first frame on knowledge and the second on data analysis and processing. How-ever in reality, while the stages proposed by Fayyad et al. do occur in most cases, the role of domain knowledge in them is also important, as discussed in this paper, while the final stage of building the knowledge base and fielding the system is also knowl-edge-intensive, often involving multiple knowledge representations and demanding many knowledge evaluation and knowledge visualization techniques.

The subject of our case study was the development of a knowledge-based decision support system for customer insolvency prediction in a large telecommunication in-dustry. During the initial problem definition phase the observation of existence of large amounts of data in the industry concerned, led to the decision of extensive use of KDD techniques during this project. However this extensive dataset did not cover all aspects of the problem. While high degree of automation in modern telephone switch-ing centres means that telephone usage by the customers of the company was well monitored, information on the customers financial situation and credit levels, which are particularly important for this problem, were missing. This is a problem that often occurs in real problems; that is different levels of automation in different aspects of the problem domain leads to non-uniform data sets. Also techniques to infer knowl-edge, based on assumptions, observations and existing data need to be used exten-sively during the problem definition and modeling phase. So, for instance, if informa-tion on the credit levels of a customer is missing, this can be inferred from information on regularity of payment of the telephone bills, based on the assumption that irregular payments are due to financial difficulties of the customers involved. This is a typical example of use of domain knowledge in the so called ‘data transformation phase’. From early stages it was deduced that a number of domain experts and sources of data had to be involved in the process. Domain experts, e.g. executives involved in tackling the problem of customer insolvency and salesmen who deal with the problem in day-by-day basis were interviewed during the problem formulation phase and their views on the problem and its main attributes were recorded. An investigation of the available data was also performed and this involved executives of the information systems and the corporate databases who could provide an early indication on sources and quality of data. Other key actors were data analysts, who were also involved together with knowledge engineers and data mining experts.

3 Business knowledge and KDD

In many KDD projects, like the case study discussed here, the domain knowledge takes the form of business knowledge, as this represents the culture and rules of prac-tice of the particular company that has requested the knowledge-based system. Busi-ness knowledge has been a subject of interest for management consultant firms and

business administration researchers [9]. Business process re-engineering (BPR) is a keyword that has been extensively used during the last years, while special attention has been put in building the so-called “institutional memory”, “lessons learned data bases” and “best practice repositories”. While there are but few examples of success-ful full-scale repositories of business knowledge in large companies today, the wide-spread application of these techniques makes worth investigating their existence. The relevance of these approaches to KDD projects and the importance of them as sources of domain knowledge to data mining efforts is evident and for this reason they should be taken in consideration. It should also be noticed that a side effect of a major data-mining project could be the adaptation of a business knowledge base with many rules and practices, which resulted from the KDD process. This is also the case with tacit knowledge and implicit knowledge, which is the not documented business knowledge, often discovered during such a project.

The distinction between domain knowledge and business knowledge is that the former relates to a general domain while the latter to a specific business, thus both are required in the case of a specific knowledge based system that is to be commissioned to a specific company. A special case of business knowledge that affects the KDD process relates to the business objectives as they become explicit and relate to prob-lem definition. These can influence the parameters of the problem and measures of performance, as discussed by Gur Ali and Wallace [10]. In the following an example of such mapping of business objectives to measures of system performance is de-scribed for our case study.

4 Use of domain knowledge in an insolvency prediction case study

In this section, some typical examples of applying domain and business knowledge in the case study of the customer insolvency problem are provided. The examples are presented according to their order of appearance in the different phases of the KDD process. In the following section a classification of the domain and business knowl-edge used is attempted. The discussion included in this section does not provide a full account of the knowledge acquisition and modeling case study. It attempts rather through examples to identify the role of domain knowledge in the various phases of the project. A more detailed account would have included details on the modelling process, which involved many iterations and revisions of discovered knowledge.

A detailed description of the problem of customer insolvency of the telecommuni-cations industry is beyond the scope of this paper. For more information on the prob-lem, the approach used and the performance of the developed system, see Daskalaki et al. [11].

4.1 Problem definition

In this phase the problem faced by a telecommunications organization was defined and requirements relating to its solution were set. The role of domain experts and the importance of domain and business knowledge in this phase is evident. For instance

the billing process of the company, the rules concerning overdue payments and cur-rently applied measures against insolvent customers need to be explicitly described by domain experts.

4.2 Creating target data set

Formulation of the problem as a classification problem was performed at this stage. Available data were identified. As often occurs in KDD projects available data were not located in the same database, while discrepancies were observed among the enti-ties of these databases. This phase was not focused on the specific features to be used as parameters for training data, but rather on broad data sets that were considered relevant, to be analyzed in subsequent steps. So the sources of data were: (a) tele-phone usage data, (b) financial transactions of customers with the company (billing, payments etc.), (c) customer details derived from contracts and phone directory en-tries (customer occupation, address etc.). As discussed earlier more details of cus-tomer credit conditions were not available in the corporate databases and could not become available from outside sources. The role of domain and business knowledge in this stage concerned the structure of the available information and the semantic value of it, so this knowledge was offered mostly by the data processing department, in particular employees involved in data entry for the information systems involved. Serious limitations of the available data were identified during this process. For in-stance it was discovered that the information systems of the organization did not make reference to the customer as an individual in recorded transactions, but rather as a phone number owner. This made identification of an individual as an owner of multi-ple telephone connections particularly difficult.

4.3 Data prepossessing and transformation

This phase is the most important preparation phase for the data mining experi-ments; The domain knowledge during this stage has been used in many ways:

(i) elimination of irrelevant attributes

(ii) inferring more abstract attributes from multiple primary values

(iii) determination of missing values

(iv) definition of the time scale of the observation periods,

(v) supporting data reduction by sampling and transaction elimination

In all the above cases the domain knowledge contributes to reduction of the search space and creation of a data set in which data mining of relevant patterns could be subsequently performed. Examples of usage of domain knowledge are: Example of case i: The attribute “billed amount” was considered as irrelevant since it is known that not only insolvent customers relate to high bills, but also very good solvent customers.

Examples of case ii: Large fluctuation of the amounts in consecutive bills is consid-ered important indication of insolvency, so these fluctuations should be esti-mated and taken in consideration.

Overdue payments have been inferred by comparison of due and payment dates of bills.

Considerable reduction of data was achieved by aggregating transactional data in the time dimension according to certain aggregation functions (sum, count, avg, stddev) and deduced attributes. Domain-related hypotheses of relevance of these de-duced attrib-utes have driven this process. An example was the DiffCount attribute that represents the number of different telephone numbers called in a given period of time and the deviation of this attribute from a moving average in consecutive time periods. Defini-tion of this attribute is based on the assumption that if the diversity of called numbers fluctuates this is an entity related to possible insolvency.

Example of case iii: In many cases the missing values were deduced through inter-related attributes, e.g. Directory entries were correlated with customer records in order to determine the occupation of a customer, payments were related to billing periods, by checking the amount of the bill etc.

Examples of case iv: The transaction period under observation was set to 6 months prior to the unpaid bill, while the aggregation periods of phone call data was set to that of a fortnight.

Example of case v: Transactions related to inexpensive calls (charging less than 0.3 euros) were considered not interesting and were eliminated, resulting in reduction of about 50% of transaction data.

Sampling of data with reference to representative cases of customers in terms of area, activity and class (insolvent or solvent) was performed. This resulted in a data set concerning the 2% of transactions and customers of the company.

4.4 Feature and algorithm selection for data mining

At this phase the data mining algorithms to be used are defined (in our case deci-sion trees, neural networks and discriminant analysis) and the transformed dataset of the previous phase is further reduced by selecting the most useful features in adequate form for the selected algorithm. This feature selection is based mostly on automatic techniques, however domain knowledge is used for interpretation of the selected fea-ture set. Also this process is used for verification of the previous phase assumptions, so if certain features do not prove to be discriminating factors then new attributes should be deduced and tested. It should also be mentioned that this feature selection process is often interleaved with the data mining process, since many algorithms select the most relevant features during the training process. In our case a stepwise discrimi-nant analysis was used for feature selection.

4.5 Data Mining

Training a classifier using the cases of the collected data is considered the most im-portant phase of the process. Depending on the mining algorithm selected, the de-rived knowledge can be interpreted by domain experts. For instance the rules defined by a decision tree can be inspected by domain experts. Also the weights related to the input variables of a neural network reflect their relevant importance in a specific net-work. This is related to the performance of the model.

Extensive experiments often take place using a trial and error approach, in which the contribution of the classes in the training dataset and the input features, as well as the parameters of the data mining algorithm used, can vary. The performance of the de-duced models indicate which of the models are most suitable for the knowledge-based system.

In an extensive experimentation that took place in the frame of our case study, 62 features were included in the original data set. Subsequently, 5 different datasets where created that where characterised by different distribution of the classes (S)olvent/ (I)nsolvent customer. These distributions were the following: (I/S: 1:1, 1:10, 1:25, 1:50, 1:100)

A ten-fold validation of each data mining experiment was performed, by redistrib-uting the training/testing cases in the corresponding data sets. This way 50 classifying decision trees were obtained. By inspecting the features that have been used in these experiments, we selected the 20 most prominent, shown in Table 1.

Table 1. Most popular features used in the 50 classifiers

Feature Feature description n.

NewCust Identification of a new connection 50

Latency Count of late payments 50

Count_X_charges Count of bills with extra charges 50

CountResiduals Count of times the bill was not paid in full 50

StdDif Std Dev. of different numbers called 50

TrendDif11 Discrepancy from the mov. avg. of four

50

previous periods of the count of different

numbers called, measured on the 11th period.

TrendDif10 Idem for the 10th period 50

TrendDif7 Idem for the 7th period 50

TrendDif6 Idem for the 6th period 50

TrendDif3 Idem for the 3rd period 50

TrendUnitsMax Maximum discrepancy from the moving

45

average in units charged over the fifteen 2-week

periods.

TrendDif5 Idem for the 5th period 43

TrendDif8 Idem for the 8th period 40

39

Average_Dif Average # of different numbers called over the

fifteen 2-weeks period.

Type Type of account, e.g. business, domestic etc. 33

31

MaxSec Maximum duration of the calls in any 2-week

period during the study period.

28

TrendUnits5 Discrepancy from the moving average of the

units charged, measured on the 5th period.

23

AverageUnits Average # of units charged over the fifteen 2-

weeks periods.

TrendCount5 Discrepancy from the moving average of the

21

total # of calls, over the fifteen 2-week periods.

CountInstallments Count of times the customer requested payment

18

by instalments.

In Table 1, one may observe that the time-dependent feature most frequently used was the one related with the dispersion of the telephone numbers called (TrendDif, StdDif etc., 9 occurrences). This is a derived feature, proposed by the domain experts as discussed above, that could not possibly be defined without the domain experts contribution. This table demonstrates the important role of the domain experts in sug-gesting meaningful features during this phase.

Case distribution 1:1

If (StdDif<0.382952541) And (MaxSec<1086)

Then

INSOLVENT (confidence 1.4%)

If (StdDif<0.382952541) And (MaxSec>1086) And (ExtraDebt>=1.5)

Then

INSOLVENT (confidence 100%)

If (StdDif>=0.382952541) And (TrendCountMax>=4.625)

Then

INSOLVENT (confidence 5.36%)

Case distribution 1:10

If (CountXCharges<1.5) And (NewCust<0.5) And (TrendDif11<-0.625) And (TrendSec3<-1863.75)

Then

INSOLVENT (confidence 0%)

If (CountXCharges<1.5) And (NewCust>=0.5) And (CountResiduals>=0.5) And (TrendDif7<-0.625)

Then

INSOLVENT (confidence 12.5%)

If (CountXCharges<1.5) And (NewCust>=0.5) And (CountResiduals>=0.5) And (TrendDif7>=-0.625) And

(StdDif<0.487950027) Then

INSOLVENT (confidence 10.93%)

If (CountXCharges>=1.5) And (StdDif>=0.305032313) And (TrendUnitsMax>=121.25) And (TrendUnits6<-

2.375) And (TrendDif10<-0.125)

Then

INSOLVENT (confidence 12.26%)

If (CountXCharges>=1.5) And (StdDif>=0.305032313) And (TrendUnitsMax>=121.25) And (TrendUnits6>=-

2.375) then

INSOLVENT (confidence 7.6%)

Case distribution 1:25

if (CountXCharges<2.5) AND (NewCust>=0.5) AND (CountResiduals>=0.5) AND (TrendCount5>=-1.25)

AND (TrendDif6<-0.375)

then

INSOLVENT (confidence 25.8% )

if (CountXCharges<2.5) AND (NewCust>=0.5) AND (CountResiduals>=0.5) AND (TrendCount5>=-1.25) AND (TrendDif6>=-0.375) AND (TrendCount5<1.375) AND (Type<55.5)

Then

INSOLVENT (confidence 55.03% )

if (CountXCharges>=2.5) AND (TrendDif3<-0.125) AND (TrendUnitsMax>=222.625) Then

INSOLVENT (confidence 9.49% )

Fig.1 Knowledge in form of rules, determining Customer Insolvency

4.6 Evaluation and interpretation of learned knowledge

Evaluation of the learned knowledge usually involves measuring the performance using a test data set. However this also involves knowledge interpretation, as dis-cussed in the previous section, which involves domain experts. Knowledge interpreta-tion can be based on the performance on test cases and on inspection of the derived knowledge if adequate knowledge representation formalism has been used. The evaluation criteria for the learned knowledge performance may be related to business objectives as defined by domain experts. An example of evaluation criteria is de-scribed in this section.

In figure 1 the knowledge in the form of rules, classifying the minority class cases (INSOLVENT customers) are exposed. It may be noticed that there is a considerable deviation in the parameters contributing to each of the rules, while the measure of performance of the rules vary considerably as indicated by the confidence measure expressing the rule performance in the test data set.

The criteria used for quantitative evaluation of learned knowledge in our case, as suggested by the domain experts, were different than the usual overall success rate and the specific class success rate indices usually applied in this kind of experiments. The domain experts suggested the following two criteria in our case study:

? The precision of the classifier, which is defined as the percentage of the actu-ally insolvent customers in those, predicted as insolvent by the classifier.

? The accuracy of the classifier, which is defined as the percentage of the cor-rectly predicted insolvent out of the total cases of insolvent customers in the data set.

These measures in problems of imbalanced class distributions, like in our case, in which the incidents of insolvent customers are very rare compared to those of solvent ones, seem more appropriate for measuring the effectiveness of the induced knowl-edge. By introducing these criteria, we discovered that the learned knowledge, despite of the fact that had very high success rates both overall and in specific classes, it did not meet the business objectives as these were defined by the Telecommunication Company (i.e. the requested measure of success was precision > 80% and accuracy > 50%).

An example of such a classifier is presented in the following table 2. In this table the performance of the classifier is shown in the testing data set. From this table one can see that the performance of this particular classifier is over 90 % in the majority class and over 83% in the minority class. However the precision is 113/2844= 3.9% and the accuracy is 113/136= 83%, thus making the performance in terms of the busi-ness objective set, not acceptable.

Table 2 Performance of classifier C1-3 for the insolvency prediction problem

4.7 Fielding the knowledge base

This stage is essential in knowledge-based system development project, while this is often omitted in data mining projects as considered outside the scope of the data mining experiment. During this phase the learned knowledge is combined with other domain knowledge in order to become part of an operational decision support system, used by the company that commissioned the KDD project. The domain knowledge plays an important role during this stage. Usually the learned knowledge is just a part of this knowledge-based system, while heuristics or other forms of knowledge are of-ten used as pre- or post-processors of the learned knowledge. In our case, the domain experts have suggested that the customers classified as insolvent, should be examined in more detail in terms of the amount due, the percentage of this amount that is due to third telecommunication operators, previous history of the customer etc, attributes that did not participate in the classification algorithm’s decision, yet important for taking measures against the suspected insolvency.

In the fielded knowledge based system important aspects are also the available means for convincing the decision-maker for the provided advice. This can be achieved by providing explanation on the proposed suggestion or visualizing the data and the knowledge used, as suggested by many researchers, see Ankerst et al [12], Brachman & Anand [2], etc.

5 Conclusion

This paper has focused on the role of domain knowledge in a data-mining project. Eight distinct phases have been identified in the process and the role of the domain experts in each one of them has been discussed. In summary this role is shown in Ta-ble 3. Predicted cases

Category Insolvent (0) Solvent (1)

Insolvent (0) 113

(83.1 %)

23 (16.9%) Actual cases

Solvent (1)

2731

(9.8 %) 25081 (90.2 %)

Table 3 Overview of use of domain knowledge in a data mining project

From this table and the discussion of the previous section it can be seen that while it is true that the domain knowledge plays a crucial role mostly in the initial and final stages of the process, it has contributed to some degree in all the phases of the project. If one takes also in consideration that the data mining phase (e), that necessitates comparatively little use of domain knowledge, accounts usually for not more than the 5% of the effort of such project, according to Williams and Huang [13], it is the most demanding stages of the process in which the domain experts and the domain knowl-edge participate mostly.

A conclusion of this study is that the data mining projects cannot possibly lead to successful knowledge-based systems, if attention is not paid to all the stages of the process. Since the domain knowledge plays such a crucial role in most of these stages, one should consider a data-mining project as a knowledge-driven process.

More support and adequate tools are therefore needed to be devised, which model the domain knowledge and track the contribution of domain experts that influence the assumptions made and the decision taken during the process.

A concluding remark is that in terms of the actors involved in the process, next to the experts related to data analysis, data mining, data warehousing and data processing in a prominent position there should be put the domain experts that should participate actively and guide the process. stage

Use of Domain Knowledge (DK) Type of DK Tools used (a) Problem definition HIGH Business and domain knowledge, requirements

Implicit, tacit knowledge

(b) Creating target data set MEDIUM

Attribute relations, semantics of corporate DB Data warehouse (c ) Data prepossessing and transformation HIGH

Tacit and implicit knowledge for inferences Database tools, statistical analysis (d ) Feature and

algorithm selection

MEDIUM Interpretation of the selected features Statistical analysis (e) Data Mining

LOW Inspection of discovered knowledge Data mining tools (f) Evaluation of learned

knowledge

MEDIUM Definition of criteria related to business objectives Data mining tools (g) Fielding the

knowledge base HIGH Supplementary domain knowledge necessary for implementing the system Knowledge-based system shells and

development tools

Acknowledgements

The research reported here has been funded under project YPER97-109 of the Greek Secretariat of Research and Technology. Special thanks are also due to the group of scientists of OTE S.A. that supplied us with data and continuous support. Special thanks to IBM for providing licenses of the DB2? and Intelligent Miner? products under their academic support programme. Also special thanks are due to the construc-tive comments of the anonymous reviewers on earlier draft of this paper. References

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Element Model, TR DM 96013, CSIRO, Canberra, Australia (1996)

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一会一会造句大全

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11、白云飘飘一会儿东一会儿西一会儿左一会儿右。 12、秋高气爽的时节,一群大雁正往南飞,一会儿排成一字形,一会儿排成人字形。 13、他像只调皮的猴子,一会儿挠腮一会儿跳上跳下。 14、我做作业老是不专心,一会儿做作业,一会儿又吃东西,一会儿又看电视。 15、上课时他一会儿东张西望,一会儿交头接耳,结果什么也没有学到。 16、美丽的小燕子一会儿蜻蜓点水般掠过湖面,一会儿像离弦的弓箭飞向远方。 17、小蜜蜂一会我采集花粉回来,一会儿采信蜂蜜回来。 18、我也不明白是怎么回事,一会儿觉得丧气,一会儿又觉得轻快。 19、动物园里的猴子一会儿爬上,一会儿窜下,可调皮了。 20、数学课上,小明一会儿跟同桌小刚聊天,一会儿和邻桌小红聊天,最后被老师批评了。 21、小猫钓鱼很不专心,一会儿捉蜻蜓,一会儿捉蝴蝶。 22、野鸭悠闲自在地浮着,一会儿跌入水底,一会儿又立在浪尖上,像孩子在打秋千。 23、小花狗跑到楼顶上,一会儿大声叫,一会儿趴在那不动。 24、我好喜欢我的语文老师,读课文的时候一会儿大声,一会儿小声,一会儿神色飞扬。

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不对。 Theway(that ,in which)you’re doingit is comple tely crazy.你这么个干法,简直发疯。 Weadmired him for theway inwhich he facesdifficulties. Wallace and Darwingreed on the way inwhi ch different forms of life had begun.华莱士和达尔文对不同类型的生物是如何起源的持相同的观点。 This is the way(that) hedid it. I likedthe way(that) sheorganized the meeting. 3.theway(that)有时可以与how(作“如何”解)通用。例如: That’s the way(that) shespoke. = That’s how shespoke.

用2个有时有时造句大全

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学去打球。 9、课间休息时间,我有时去操场散步,有时和同学跳皮筋。 10、天上的月亮有时像一把镰刀,静静地挂在天空,懒得动一下;有时像一的大银盆,又圆又大的。 11、人生总是包含着五味杂陈,有时你会感到快乐,有时你会遭遇困难,有时你会期待梦想,有时也会充满感伤,必须每样都经历才算完整。 12、观看比赛的观众有时鼓掌为运动员加油,有时呐喊为选手鼓劲。 13、喷泉有时像百花怒放,有时像凤凰一飞冲天。 14、我的爸爸有时候严厉,有时候慈祥。 15、小猫咪有时淘气,有时可爱。 16、我有时可笑,有时悲伤。 17、在周末,小明有时在家里看电视,有时去爷爷奶奶家玩。 18、一群大雁往南飞,它们有时排成一字,有时排成人字。

19、天气千变万化,有时晴天,有时阴天。 20、人生际遇总是变幻莫测,有时如顺风行船,喜笑颜开;有时如雪中登山,凶险万分。 21、月亮有时像圆盘,有时像镰刀。 22、亮有时象圆盘,有是象镰刀,有时又象个光环。 23、我有时步行去学校,有时骑车去。 24、妈妈去外地出差了,我有时给妈妈打电话,有时我还给妈妈发短信。 25、这些天,她有时高兴,有时悲伤,有时又整天沉默无语,一定是发生了什么事。 26、生命如水,有时潺潺的流动,有时静静的盘桓。 27、仙女们在这片神奇的绿野上游戏,有时跳舞,有时歌唱,有时漫步,有时飞翔。 28、小鸟们有时在天空中展翅高飞,有时停在树枝上婉转啼叫。 29、他的课余生活丰富。有时打篮球,有时上网。

知己的近义词反义词及知己的造句

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6、波兰斯基有着一段声名卓著的电影生涯,也是几乎所有电影界重要人物们的挚友和同事,他们是知己,是亲密的伙伴。 7、搜索引擎变成了可以帮追我们的忏悔室,知己,信得过的朋友。 8、这样看来,奥巴马国家安全团队中最具影响力的当属盖茨了――但他却是共和党人,他不会就五角大楼以外问题发表看法或成为总统知己。 9、我们的关系在二十年前就已经和平的结束了,但在网上,我又一次成为了他精神层面上的评论家,拉拉队,以及红颜知己。 10、这位“知己”,作为拍摄者,站在距离电视屏幕几英尺的地方对比着自己年轻版的形象。 11、父亲与儿子相互被形容为对方的政治扩音筒、知己和后援。 12、这对夫妻几乎没有什么至交或知己依然在世,而他们在后纳粹时期的德国也不可能会说出实话的。 13、她把我当作知己,于是,我便将她和情人之间的争吵了解得一清二楚。 14、有一种友谊不低于爱情;关系不属于暖昧;倾诉一直推心置腹;结局总是难成眷属;这就是知己! 15、把你的治疗师当做是可以分享一切心事的知己。 16、莉莉安对我敞开心胸,我成了她的知己。 17、据盖洛普民意调查显示,在那些自我认同的保守党人中,尽管布什仍维持72%支持率,但他在共和党领导层中似乎很少有几位知

way 用法

表示“方式”、“方法”,注意以下用法: 1.表示用某种方法或按某种方式,通常用介词in(此介词有时可省略)。如: Do it (in) your own way. 按你自己的方法做吧。 Please do not talk (in) that way. 请不要那样说。 2.表示做某事的方式或方法,其后可接不定式或of doing sth。 如: It’s the best way of studying [to study] English. 这是学习英语的最好方法。 There are different ways to do [of doing] it. 做这事有不同的办法。 3.其后通常可直接跟一个定语从句(不用任何引导词),也可跟由that 或in which 引导的定语从句,但是其后的从句不能由how 来引导。如: 我不喜欢他说话的态度。 正:I don’t like the way he spoke. 正:I don’t like the way that he spoke. 正:I don’t like the way in which he spoke. 误:I don’t like the way how he spoke. 4.注意以下各句the way 的用法: That’s the way (=how) he spoke. 那就是他说话的方式。 Nobody else loves you the way(=as) I do. 没有人像我这样爱你。 The way (=According as) you are studying now, you won’tmake much progress. 根据你现在学习情况来看,你不会有多大的进步。 2007年陕西省高考英语中有这样一道单项填空题: ——I think he is taking an active part insocial work. ——I agree with you_____. A、in a way B、on the way C、by the way D、in the way 此题答案选A。要想弄清为什么选A,而不选其他几项,则要弄清选项中含way的四个短语的不同意义和用法,下面我们就对此作一归纳和小结。 一、in a way的用法 表示:在一定程度上,从某方面说。如: In a way he was right.在某种程度上他是对的。注:in a way也可说成in one way。 二、on the way的用法 1、表示:即将来(去),就要来(去)。如: Spring is on the way.春天快到了。 I'd better be on my way soon.我最好还是快点儿走。 Radio forecasts said a sixth-grade wind was on the way.无线电预报说将有六级大风。 2、表示:在路上,在行进中。如: He stopped for breakfast on the way.他中途停下吃早点。 We had some good laughs on the way.我们在路上好好笑了一阵子。 3、表示:(婴儿)尚未出生。如: She has two children with another one on the way.她有两个孩子,现在还怀着一个。 She's got five children,and another one is on the way.她已经有5个孩子了,另一个又快生了。 三、by the way的用法

出现造句大全

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价值。 7、正当我高兴的流下泪水时,闹钟忽然响了,它把我从梦中拉出来,才知道原来是场梦,但我坚信,在不久的将来,我一定会出现在奥运会上,为中国队努力拼搏。 8、世界上没有谁选择谁,只有谁遇到谁,所以我不选ABCD,只看着时间刚刚好的时候,出现在你面前,然后,牵着手,去哪里那里,然后,就是一辈子。 9、只见月亮像一个害羞的姑娘,羞答答地从一片乌云背后伸出半个脑袋,偷偷地向下窥探,发现没有什么动静,一扭身,出现在天空中,天空就好像出现了一盏明亮的灯,周围的乌云被白色的月光照着。 10、情痴先生,多谢你的痴情。对于我在你的梦中出现这件事,令我十分震惊。你没有征求我的同意,便让我出现在你的梦里,侵犯了我的自由,我保留所有法律上追究的权利跟赔偿。还有,你没有告诉我在梦里你对我做了什么? 11、到19世纪70年代,那些实际生活中的作奸犯科者、道德沦丧者,竟然已经堂而皇之地出现在歌舞表演中,这一幕与如今八卦电视节目何其相似,文化垃圾商品的真人版而已! 12、以前只是一种经历与感觉,而不是证据,不需要为以前的喜欢付出现在或以后的责任。不要揪住以前的事情不放。现在的事实比以前的回忆更有实效性与说服力。 13、法律不等于正义,这是一种非常不完美的机制,如果你按

小学语文反义词仿照的近义词反义词和造句

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十一、仿照例句,任选一种事物,写一个句子。 十二、仿照下面一句话的句式和修辞,以“时间”开头,接着写一个句子。 十三、仿照例句,以“热爱”开头,另写一句子。 十四、仿照下面的比喻形式,另写一组句子。要求选择新的本体和喻体,意思完整。 十五、根据语镜,仿照划线句子,接写两句,构成语意连贯的一段话。 十六、仿照下面句式,续写两个句式相同的比喻句。 十七、自选话题,仿照下面句子的形式和修辞,写一组排比句。 十八、仿照下面一句话的句式,仍以“人生”开头,接着写一句话。 十九、仿照例句的格式和修辞特点续写两个句子,使之与例句构成一组排比句。 二十、仿照例句,另写一个句子,要求能恰当地表达自己的愿望。 二十一、仿照下面一句话的句式,接着写一句话,使之与前面的内容、句式相对应,修辞方法相同。 二十二、仿照下面一句话的句式和修辞,以“思考”开头,接着写一个句子。 二十三、仿照下面例句,从ABCD四个英文字母中选取一个,以”青春”为话题,展开想象和联想,写一段运用了比喻修辞格、意蕴丰富的话,要求不少于30字。 二十四、仿照下面例句,另写一个句子。 二十五、仿照例句,另写一个句子。 二十六、下面是毕业前夕的班会上,数学老师为同学们写的一句赠言,请你仿照它的特点,以语文老师的身份为同学们也写一句。

The way的用法及其含义(一)

The way的用法及其含义(一) 有这样一个句子:In 1770 the room was completed the way she wanted. 1770年,这间琥珀屋按照她的要求完成了。 the way在句中的语法作用是什么?其意义如何?在阅读时,学生经常会碰到一些含有the way 的句子,如:No one knows the way he invented the machine. He did not do the experiment the way his teacher told him.等等。他们对the way 的用法和含义比较模糊。在这几个句子中,the way之后的部分都是定语从句。第一句的意思是,“没人知道他是怎样发明这台机器的。”the way的意思相当于how;第二句的意思是,“他没有按照老师说的那样做实验。”the way 的意思相当于as。在In 1770 the room was completed the way she wanted.这句话中,the way也是as的含义。随着现代英语的发展,the way的用法已越来越普遍了。下面,我们从the way的语法作用和意义等方面做一考查和分析: 一、the way作先行词,后接定语从句 以下3种表达都是正确的。例如:“我喜欢她笑的样子。” 1. the way+ in which +从句 I like the way in which she smiles. 2. the way+ that +从句 I like the way that she smiles. 3. the way + 从句(省略了in which或that) I like the way she smiles. 又如:“火灾如何发生的,有好几种说法。” 1. There were several theories about the way in which the fire started. 2. There were several theories about the way that the fire started.

一下子造句大全

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7、过了一会儿,雨变小了,微风吹来,雨帘斜了,像一根根针线似的刺向草木、墙壁。雨落在小草上,看,草儿轻轻地在微风中摇动,雨珠顺着它那翠绿的茎滚下来,有一滴一下子钻到土里,又一滴钻到小草的嘴里,找不着了。 8、妈妈的手也是温柔的手。每当我生病了,妈妈便用她的手无微不至地照料着我,我感觉病一下子好了许多,心中无比温暖。每当我受到挫折感到委屈时,妈妈也会用她那双手轻轻拍拍我的肩膀,鼓励我,给我勇气和力量。 9、只见他嘴张得像箱子口那么大,一下子就愣住了,接着他就咽了两三口唾沫,好像是嗓子里发干似的。 10、突然门外传来嘈杂声,接着是敲门声,一下子又给大叫声所覆盖。我连忙去外面看看发生什麽事,当我看到我家门外的几个人时,我呆在那儿了,那陌生又熟悉的脸庞,都带着亲切的微笑,我不禁也露出微笑,请他们进家中。 11、早上起雾了,小溪里最浓,什么也看不见,我便高兴了,走下去,哪知它们一下子便将我拥围起来。慢慢地太阳升起,穿过树林,溪边的小草显得更加鲜嫩油滑了。我坐在木屋窗口下读书,让这一切陪我畅想。 12、蒋百里在宜山的南边路上,汽车坏了,他受了一下子凉,就有一点半身不遂的样子。 13、在座的人全都受到他影响,一下子也都变得严肃起来。就像钢水突然落到冷水里,一下子整个脸都凝固了。

暗示的近义词和反义词 [暗示的近义词反义词和造句]

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