用介词短语来代替状语从句
1.While it is being compacted, considerable lateral横(向)的pressure
is exerted by concrete.
2.If pressure is constant, gases will expand when heated.
3.If values of W are small, the impedance of the capacitor is large
relative to R.
4.When temperatures are greater than 60℃，this equation does not
apply.
5.While it is being compacted, considerable lateral pressure is
exerted by concrete.
?During compacting/compactification,(a) considerable lateral pressure is exerted by the concrete.
?At/For/With constant pressure, gases will expand when heated.?For/With small values of ω,the impedance of the capacitor is large relative to R.
?At/With temperatures greater than 60oC, this equation does not apply.
名词短语代替状语从句
6.If the diode is analyzed physically, it can be shown that
7.In this case electrons will possess more energy, so that the
brightness of the spot can be increased.
A physical analysis of the diode shows that
?In this case electrons will possess more energy, thus increasing the brightness of the spot.
1.Some water which has been distilled some distilled water
2.A bridge which has been incorrectly designed an incorrectly
designed bridge
3.The substances which are not known the unknown substances
4.A problem which has still not been solved an unsolved problem
5.Satellites which are made by man man-made satellites
6.Signals which are modulated in amplitude振幅amplitude-modulated
signals
7.Steel which is plated with chromium铬chromium-plated steel
8.Pumps which are driven by wind wind-driven pumps
9.The instruments which are used the instruments used
10.The number of mistakes which have been found the number of
mistakes found
11.The new cars which a used for racing the new racing cars
12.Paper which is used for drawing drawing paper
13.Bodies which fall freely freely falling bodies
14.A country which produces oil an oil-producing country
15.The point at which it boils the boiling point
16.Material is tested in this way material so/thus tested
17.Paper which has blue lines blue-lined paper
18.A saw which has wide teeth a wide-toothed saw
19.A triangle which has acute angles an acute-angled triangle
将下面句子翻译虚拟语气
若没有半导体(semiconductor),卫星通讯(satellite communications)就不可能了。
②我们本来也可以用定理(theorem)(6)来导出(derive)式(5)
③一旦出现什么情况,尽快让我们知道。
④数字(digital)设计人员(designer)很好地了解布尔代数(Boolean algebra)是十分必
要的。
⑤有人建议在太空制造药物(drug).
⑥这来自于输出要稳定(stable)这一需要(necessity)。
⑦其条件是(x-a)为一个根(root)。
⑧这根传输线(transmission line)的作用好像它是开路(open-circuit)似的。
⑨我们周围的一切东西,无论是空气、水还是木头(wood),都是物质
1 Without semiconductors, satellite communications would be impossible.
2 We could also have used Theorem (6) to derive Eq. (5).
3 Should anything happen, let us know as soon as possible.
4 It is quite essential that digital designers (should) have a good knowledge of Boolean algebra.
5 It is suggested that drugs be made in space.
6 This comes from the necessity that the output be stable.
7 Its condition is that (x–a) be a root.
8 This transmission line acts as if it were open-circuit.
9 Everything around us, be it air, water or wood, is matter.
名词化结构主语
1.If the thickness of the lagging（绝热材料）is increased, it will
reduce the heat losses.
2.If machines are tested by this method, there will be some loss of
power.
3.If the temperature rises by 50℃, it would result in a in Zener
voltage of 3.75%.
4.If these listings are studied , it will greatly help the programmer
in finding any errors made in writing the program.
5.If the diode（二极管）is physically analyzed, it will be shown that
the current and voltage are related by the following equation ?An increase in the thickness of the lagging will reduce the heat losses.
?The testing of machines by this method will entail/result in some loss of power.
? A temperature rise of 50oC [OR: A rise in/of temperature by 50oC] would result in a change in Zener voltage of 3.75%.
? A study of these listings will greatly help the programmer in
finding any errors made in writing the program.
? A physical analysis of the diode shows that the current and voltage are related by the following equation.
现在分词作状语 一、现在分词短语在句中可以作条件状语， 其逻辑主语须为句中的主语，该短语相当于一个条件状语从句。 Working hard, you'll succeed. = If you work hard, you'll succeed. 如果你努力工作，你会成功的。 Turning to the left, you will find the path leading to the park. = If you turn to the left, you will find the path leading to the park.如果转向左边，你将找到通向公园的小道。 二、分词短语在句中作让步状语 分词短语在句中作让步状语时，相当于一个让步状语从句，有时分词前可以带有连接词although, whether, even if, even though。 现在分词短语作让步状语，分词的逻辑主语是句中的主语，变成状语从句时，需用主动语态。 Weighing almost one hundred jin the stone was moved by him alone. = Although the stone weighted almost one hundred jin, it was moved by him alone. 虽然那块石头重将近一百斤，他一个人就把它挪动了。 三、分词短语在句中作结果状语 现在分词短语在句中可以作结果状语，它的逻辑主语便是句中的主语，该短语相当于一个结果状语从句，且用主动语态。分词短语在句中作结果状语时，通常位于句末，中间有逗号。有时为了加强语气，就在分词前加thus。 Their car was caught in a traffic jam, thus causing the delay. = Their car was caught in a traffic jam, thus it caused the delay.他们的车遇上交通阻塞，因而耽误了。 四、分词短语在句中表示方式或伴随情况 分词短语表示方式或伴随情况是比较常见的。它用来说明动作发生的背景或情况。一般情况下，现在分词所表示的动作与谓语所表示的动作同时发生，它的逻辑主语就是句中的主语，谓语动词作为主要动作，而现在分词表示一个陪衬动作，它没有相应的状语从句可以转换，但可以用并列句来转换。过去分词可以说明谓语动作的背景。过去分词与其逻辑主语之间有动宾关系。如： The children ran out of the room, laughing and talking merrily. The children laughed and talked merrily, and they ran out of the room. 那些孩子们跑出房间，愉快地笑着、说着。 Helped by their teacher, the students finished the task successfully. 在老师的帮助下，学生们成功地完成了任务。 五、现在分词短语作时间状语有以下三种情况： 1．分词动作一发生，谓语动作紧跟着发生，这时用现在分词的一般式作时间状语，其逻辑主语为句中的主语。常用的动词，如：hear, see, arrive, return, get to, look, open, close, leave, turn around, walk等，表示一个极短暂动作。 此种情况可以换作on+动名词，表示相同的意思。译作"一（刚）……就……"。 此种情况也可以换作是when引导的时间状语从句，该从句的动词多用一般过去时表示。Hearing their teacher's voice, the pupils stopped talking at once.
一、状语从句分类及常用连词： 类别连词 状语从句when, whenever, while, as, before, after, since, till, once, as soon as,etc. 状语从句where,wherever 状语从句because, since, as, for, now that, etc. 状语从句so…that, so that, such…that, that, etc. 状语从句in order that, so that, that, etc. 状语从句if, unless, as(so)long as, etc. 状语从句though, although, even if, even though, however, whatever, as,etc. 状语从句as…as, so…as, than, etc. 状语从句as, as if, as though, etc. 二、相似连词的用法区别 1.when, while, as, while表时间，从句需用延续性动词，切不可用瞬间动词。 when表时间，从句既可以用延续性动词，又可以用瞬间动词。 as表时间，与when相似，但侧重强调主从句动作同点或同段进行。 when, while后可以接分词短语。 2.because, as, since, for 语气位置意义 because最强前或后“原因”；表客观因果关系；回答“”as较强前“由于”；把众人所知的事实当作理由since较弱前“既然”；就对方陈述的事实作为理由for最弱后“理由”；对某一事实进行推断的理由 注：上面所说的“前”，指从句在主句之前；“后”，指从句在主句之后。 3.so that, so…that, such…that so that“以便”、“结果”表目的和结果。注意：在从句中有情态动词表目的。无情态动词表结果。 so…that “如此的…以致于”表结果。该结构常见于： 1.so+形／副＋that 2.so+形＋a(an)＋单数名词＋that 3.so＋manymuch＋复数名词（不可数名词）+that such…that“如此的…以致于”表结果。该结构常见于： 1.such＋a(an)＋形＋名词＋that 2.such＋形＋复数名词／不可数名词＋that
高中英语之介词和介词短语知识点 介词的分类 介词短语的功能 介词不能独立在句中做成份，介词后必须与名词、代词、或动名词构成介词短语在句中充当一个成分，表示人、物、事件等与其它人、物、事件等之间的关系。 1、做定语 如：They didn't find the solution to the problem. 2、做状语 如：We have breakfast at seven.(表时间） They were late for the meeting because of the heavy rain.(表原因） 3、做表语 如：What do you mean by doing such a thing?(表方法）Nothing in the world could live without air or water.(表条件）4、作宾语补足语 如：I found the old building in a bad condition.
常考介词辨析 介词是英语中最活跃的词类之一，使用频率相当高，其用法跟冠词一样复杂。 1、表示相同或相似概念的介词（短语）的区别
2、常见同一形容词与不同介词搭配时意义上的差别 3、容易混淆的含有介词固定搭配的词组
4、常用介词辨异 ①about,on,of 关于 （1）on 多用于慎重的、正式的语言交际场合。常见于”学术上”的”论文”或”演说”等题目，可供专门研究这一问题的人阅读，有”论及”之意。 （2）about表示的内容多为普遍、不那么正式，有”述及”之意。 （3）of作”关于”讲，表示提及、涉及某人（事）时，只表示事情存在或发生，并不涉及详情；有时与about意义相
高考英语专题练习（五） 介词与介词短语 1．The university started some new language programs to cater _______ the country's Silk Road Economic Belt. 2．The whole team count _______ Cristiano Ronaldo, and he seldom lets them down. 3．Many of the things we now benefit from would not be around but _______ Thomas Edison. 4．Have you ever heard of the trees that are homes _______ animals both on land and sea? 5．Most people work because it's unavoidable. _______ contrast, there are some people who actually enjoy work. 6．We tend to have a better memory for things that excite our senses or appeal _______ our emotions than for straight facts. 7．These comments came in response _______ specific questions often asked by local newsmen. 8．This meeting room is a non－smoking area. I would like to warn you _______ advance that if you smoked here you would be fined. 9．Last year was the warmest year on record, with global temperature 0.68℃_______ the average. 10．The little pupil took his grandma _______ the arm and walked her across the street. 11．Last year was the warmest year on record, with global temperature 0.68℃____ the average. A．below B．on C．at D．above 12．September 30 is the day ______ which you must pay your bill. A．by B．for C．with D．in 13．These comments came _______ specific questions often asked by local newsmen. A．in memory of B．in response to C．in touch with D．in possession of 14．What we expect from you is working hard hardly working? A．less than B．rather than C．as well as D．as much as 15．_______ a common memory they all have their school days is the school uniform. A．of B．on C．to D．with 16．Check carrots, potatoes, onions and any other vegetables ______ and immediately use or throw away any which show signs of rotting. A．in demand B．in store C．on loan D．on sale 17．Jane stopped where a small crowd of men had gathered. She found some good quality pipes _______ sale. 18．But Mr. Fox hopes his new invention will offer a solution _______ these villages without a local shop. 19．When Jane got home, with her small but well－chosen present in her bag, her parents were already _______ table having supper. 21．Going to college helps build a strong mind, which leads _______ greater success in one's life. 22．Respect is very important _______ home, at school, and everywhere you go.
分词短语作状语的时态和语态 1. 分词的时态及其判断 * 过去分词没有时态形式的变化，因此been done 和had done 任何时候都不会出现。 * 现在分词有两种时态形式： 一般形式：doing 完成形式：having done * 判断分词用什么形式主要是要与句子中的主要动词行为发生时间进行对比，如果同时或相继发生，用一般式；如果分词的行为的发生时间早于主要动词的发生时间，则用完成式。例如：--Working there, we learned a lot from them. (劳动的同时学到了许多) --Looking out of the window, I saw groups of children play games. (先望出去，接着就看到，视线没有断开) -- Having finished his work, he went to help his classmates.(完成工作在前，帮助他人在后，中间有停顿) -- Not having done it right, I tried again. (没做好在前，明显停顿后再次尝试) * 伴随状语是与主要动词的行为同时发生的动作，如果有前有后就不成其为伴随，所引不能用完成形式having done 表示，否则就是逻辑错误。 2. 分词的语态及其判断
* 过去分词本身就表示被动 * 现在分词的被动语态同样有两种形式 一般式：being done 完成式：having been done * 主动与被动的判断主要是要找到分词的逻辑主语，一般说来，用作状语的分词，其逻辑主语就是句子的主语，它们之间有两种关系：逻辑主语是分词行为的支配者，即主谓关系——用现在分词主动形式表示； 逻辑主语是分词的行为对象，即动宾关系——用过去分词或现在分词的被动形式,分别表示： 过去分词——与主要动词先后发生，如： -- Inspired him, we decided to work harder. (被鼓励接下来决定更加努力) 现在分词一般式——与主要动词同时发生，如： -- Being surrounded, the enemy was forced to surrender.（被包围的同时被迫投降） 现在分词完成式——先于主要动词的动作，如： -- Having been asked to stay, I couldn't very well leave. (先被要求留下，（考虑后)觉得不好离开。 * 独立主格结构：
非谓语动词分词作状语
1 Adverb Clause of time时间状语从句 1 日子一天天过去，天气越变越坏 As the day went on, the weather got worse. 从句表示"随时间推移"连词用as，不用when 或while. 2 恰恰在交通灯变红时，我停住了车。 Just as / When the traffic light turned red, I stopped my car. ?不同时发生 1 我陪你直到你妈妈回家。 I will stay with you until your mother comes home. I won’t leave you until your mother comes home. 2 在拿到钱后，他迅速地离开了银行。 After he had got the money, he left the bank immediately. After having got the money, he left the bank immediately. Before he had got the money, he didn’t leave the bank. Before having got the money, he didn’t leave the bank. 3 自从我生病以来，他就屡次给我写信。 He has written to me frequently since I was ill. 4 我到家后就给你打电话。 I’ll phone you when I get home. As soon as I get home, I’ll phone you. as soon as表示立即发生。
介词和介词短语(知识梳理) 真题再现： 1. 〔They believe that there are transport developments ______ that will bring a lot of changes for the better. A. out of date B. out of order C. around the clock D. around the corner 2. Last year was the warmest year on record, with global temperatur e 0.68 ℃____ the average. A. below B. on C. at D. above 3. Have you ever heard of the trees that are homes _________ anim als both on land and sea? A. about B. to C. with D. over 4. Most people work because it’s unavoidable. , there are some people who actually enjoy work. A. As a result B. In addition C. By contrast D. In conclusion 5. These comments came specific questions often asked b y local newsmen. A. in memory of B. in response to C. in touch with D. in possession of 6. Many of the things we now benefit from would not be around __ ______ Thomas Edison. A. thanks to B. regardless of C. aside from D. but for 7. This meeting room is a non-smoking area. I would like to warn y ou _______ that if you smoked here you would be fined.
专题四介词和介词短语 满分突破 Ⅰ.单选练考点 ( )1.Neil Armstrong was the first man to walk on the moon 20 July 1969. A.in B.on C.at D.for ( )2. The Dragon Boat Festival falls May or June every year. A.in B.on C. at D.between ( )3.More and more people in Qingdao go to work subway now. A.with B.on C.in D.by ( )4.Frank is an independent boy. His parents are proud him. A.on B.to C.in D.of ( )5.—Excuse me, is there a computer room in your school? —Yes. It’s the fifth floor. A.on B.in C.at D.to Ⅱ.完成句子:根据所给汉语意思，用短语完成下列英文句子 1.有人担心将来机器人会取代人类。 Some people worry that robots will take the place of humans . 2.在那个年代，书籍是靠手工制作的。 In those days, books were produced . 3.总体来说，这个产品满足了大部分顾客的需求。 , the product meets most of customers’ need. 4.扬州位于江苏中部，以其悠久的历史和文化而闻名。 Yangzhou lies Jiangsu Province and is known for its long history and culture. 5.克里在公园对面的中国银行上班。 Rick works at the Bank of China . Ⅲ.用方框中所给词的适当形式填空 1. a cold winter morning, I met her in the street. 2.The English teacher told me to get there half past ten. 3.Miss Wang will come to Beijing two days. 4.Do you see the kite the building? 5.The thief got into the room the window.
[非谓语动词和从句转换]状语从句与分词作 状语的转换 篇一: 状语从句与分词作状语的转换 状语从句与分词作状语的转换 时间、原因等状语从句可以转换成分词作状语，但这种转换是有条件的，也有一定的规律可循。[] 一、基本规则，也是最重要的规则是：从句的主语与主句的主语必须一致，变从句而主句不变。如： They did not go to the Summer Palace because they had a lot of work to do． 由于从句的主语与主句的主语都是they，可以把从句中because 和they去掉，把had变成having，即成现在分词短语作原因状语：Having a lot of work to do，they did not go to the Summer Palace． 二、从句如果表示主动、完成，进行的动作，则转换成现在分词；如果表示被动，则转换成过去分词。 1．When he heard a cry for help，he rushed out． 从句中，he was与heard是主动关系，表示“他听见”。则可变成现在分词作时间状语。 Hearing a cry for help，he rushed out． 2．The boy Cater went up to his teacher and said“sorry”because he
was great-ly touched by his words．从句中，he was touched是被动关系，是“孩子被深深地触动了”，则变成过去分词作原因状语。Greatly touched by his teache r’s words，the boy laterwent up to him and said“sorry”． 三、如果从句的主语与主句的主语不一致，该怎么办？请看下例： 1．As the heroes’ deeds moved them deeply，they decided to study even harder． 句中，主句的主语是they，而从句主语是the heroes’deeds，主语不一致，这时可以把从句变换一下句型，变成被动语态。即成As they w ere deeplymoved by the heroes’deeds．从句的主语与主句的主语都是they，就可转换成： Deeply moved by the heroes’deeds，they decided to study even harder． 下列的句子中主语也是不同的。 2．The professor came into the lab；a group of students followed him． 这是两个简单句，如果中间加个and也可看成并列句。但主语不同，可以先把第二句变成：He was followed by a group of students．全句就转换成： Followed by a group of students，the professor came into the lab． 四、如果看不出有从句，该怎么办？请看下例： He recognized the man who had been his classmate ten years
专题九连词和状语从句 1.【2015·湖南】24.Video games can be a poor influence if ________ in the wrong hands. A. to leave B. leaving C. leave D. left 【答案】D 【考点定位】考查状语从句中的省略问题。 【名师点睛】一般说来省略现象多出现在下列五种状语从句中:由 when ,while ,as ,before, after , till, until, once等引导的时间状语从句；由whether ,if , unless 等引导的条件状语从句；由 though , although ,even if ,whatever等引导的让步状语从句；由 as ,than 等引导的比较状语从句；由as, as if , as though 等引导的方式状语从句。上述状语从句在省略时，并非任何成分都可以省略而是遵循下面原则：（1）当状语从句的主语与主句的主语一致时且从句中含有be动词的某种形式时，可以省略状语从句的主语和系动词be 。（2）当从句的主语与主句的主语不一致，但从句主语是 it，从句中又含有系动词be 的某种形式时，可以把it和系动词be一起省略。此题的形式属于：连词(when ,if ,even if ,unless ,once ,until, than , as ) + 过去分词。完整的句子就是：Video games can be a poor influence if they are left in the wrong hands. 2.【2015·北京】25.He is a shy man,___he is not afraid of anything or anyone. A.so B. but C.or D. as 【答案】B 【解析】 试题分析：句意：他是一个害羞的人，但是他并不害怕任何事和任何人。A. so因此；B. but 但是；C. or或者；D. as作为。根据句意，前后句表示转折，因此选择but。 【考点定位】考查连词辨析 【名师点睛】本题考查连词中在句子中的应用，做题时要分析前后句中所用的连词表示的是什么关系，看语境中前后句子的关系是转折还是并列，所以做好此类题先了解连词的意思，
?介词和介词短语的概念： 介词是一种用来表示词与词、词与句之间的关系的虚词，在句中不能单独作句子成分。介词后面一般有名词、代词或相当于名词的其他词类，短语或从句作它的宾语。介词和它的宾语构成介词词组，在句中作状语，表语，补语或介词宾语。介词可以分为时间介词、地点介词、方式介词和其他介词。 ?误用介词的三种情况： 1、多用介词： 多用介词可能是受汉语意思的影响将及物动词误用作不及物动词，也可能是受相关结构的影响而用错： 误：We discussed about the plan. 正：We discussed the plan. 我们讨论了计划。 误：Did he mention about the accident? 正：Did he mention the accident? 他提到那次事故了吗? 误：I saw her enter into the bank. 正：I saw her enter the bank. 我看见她进了银行。 误：He married with[to] a nurse. 正：He married a nurse. 他同一位护士结了婚。 误：How can contact with you? 正：How can contact you? 我怎么与你联系? 误：We should serve for the people heart and soul. 正：We should serve the people heart and soul. 我们应该全心全意地为人民服务。 误：Who controls over the factory? (但名词control可接over) 正：Who controls the factory? 谁管理这个工厂? 误：He has a great many of friends here. (比较a great number of) 正：He has a great many friends here. 他在这儿有很多朋友。 2、漏用介词： 漏用介词可能是受汉语意思的影响将不及物动词误用作及物动词，或是受相关结构的影响的影响而用错等：误：This matter is difficult to deal. (deal with=处理) 正：This matter is difficult to deal with. 这事很难处理。 误：He is not a man to be depended. 正：He is not a man to be depended on. 他不是个可靠的人。 误：He took a cup of tea, and went on the story. 正：He took a cup of tea, and wentonwiththestory.他喝了一口茶，又接着讲故事。 误：My mother still regards me a child. (比较consider…as中的as可省略) 正：My mother still regards me as a child. 我母亲还把我当小孩看。 误：They insisted sending a car over to fetch us. 正：They insisted on sending a car over to fetch us.他们坚持要派车来接我们。 误：What he says is worth listening. 正：What he said is worth listening to.他的话值得一听。 3、错用介词： 错用介词的情况比较复杂，可能是因受汉语意思的而错，也可能是因弄不清搭配关系而错，可能是混淆用法而错，也可能是受相关结构的影响而错，可能是忽略语境而错，也可能是想当然的用错：
备战高考英语专题-介词和介词短语-巩固提升练习（含解析） 一、单选题 1.Human life is regarded as part of nature and, as such, the only way for us to survive is to live ______nature. A.in view of B.in need of C.in touch with D.in harmony with 2.On May 5, 2018, various memorial events were held nationwide ________ the 200th Anniversary of Karl Marx's birth. A.in charge of B.in place of C.in honor of D.in explanation of 3.You will be amazed to discover that what confused you at first makes sense _____further readings. A.to B.of C.upon D.before 4.Scientists are convinced _____ the positive effect of laughter _____ physical and mental health. A.of; at B.by; in C.of; on D.on; at 5.______Christmas coming near, they began to be busy shopping for the holiday. A.As B.Before C.Because of D.With 6.Doctors battled the night to save her life. A.within B.out of C.throughout D.inside 7.—How about this type of car，sir?—It's not economical，and what's more，it's________. A.out of shape B.free of charge C.out of order D.on the way out 8.After the dinner, I looked at the bill and found that it was 200 yuan , including the wine. A.after all B.in all C.at all D.above all 9.After a heated discussion at the meeting，a new plan came________being，which would have a great effect________the culture life of people. A.into；for B.to；to C.from；at D.into；on 10.the economic crisis getting more and more serious, the government is searching for ways to improve people's life. A.As B.With C.When D.If 11.piracy,it is necessary that effective measures should be taken right away to stop it. A.Due to B.As to C.Thanks to D.Next to 12.Before real estate control policies were introduced, people hoped that their income would be increased ________ the rise in housing prices. A.in touch with B.in anticipation of C.in line with D.in combination of 13.Do you really want to rent such a flat which is empty ________ some old pieces of furniture? A.besides B.except for C.for D.except
分词作状语： 分词和分词短语作状语时，可以表示时间、原因、条件、让步、方式和伴随情况。在表示时间、原因、条件、让步和方式时，通常可转换为相应的状语从句，表示方式和伴随情况时，可以转换为一个并列的谓语成分。 例如：Seeing the teacher entering the room,the students stood up.(=When the students saw the teacher entering the room,they stood up.) Heated,ice will be changed into water.(=When it is heated...) Being excited, I couldn’t go to sleep.(=As I was excited,I couldn’t go to sleep.) I stood there, listening to the broadcast.(=I stood there and listened to the broadcast.) The children went away laughing.(=The children went away.They laughed as they went.) Knowing all this,they made me pay for the damage.(=Although they know all this... (3)分词作状语与主语的关系。 A. 现在分词作状语时，现在分词的动作就是句子主语的动作，它们之间的关系是主动关系。 例如：He went out shutting the door behind him. Not knowing what to do, he went to his parents for help. B. 过去分词作状语时，过去分词表示的动作是句子主语承受的动作，它们之间的关系是被动关系。 例如：Given more attention,the trees could have grown better. F aced with difficulties,we must try to overcome them. (4)分词作状语时前面可用连词。 when,while,once,if,unless,though等引导的状语从句，若其主语与主句主语相同时，可保留该副词连接词，其余部分则化简为分词短语。 例如：When (being) free，I’ll fetch you. While walking along the street early in the morning,he saw her. If falling ill,I’ll see my doctor.如果生病我会去看医生。 Once completed,this power station supplies the nearby towns and villages with electricity. Even though given every opportunity,they would not try. Though knowing the truth,he remained silent. Unless (being) rich,I am not going abroad. (5)分词作状语时，要特别注意其逻辑主语须和谓语动词的主语一致，否则分词必须有自己的主语。这种带主语的分词结构称作分词的独立结构，或独立主格。 例如：The rain having stopped,the soldiers continued their match. The boys returned,their face covered with sweat. 〈注〉有时也可用“with(或without)+名词(或代词宾格)+分词”的结构，表示伴随情况。 例如：He fell asleep with the lamp burning.
1、状语从句中的谓语动词是系动词be时: 1.1、当从句主语与主句主语相同时，只要去掉从句中的连接词与主语并把be改为being. 即可。 As he is a tailor, he knows what to do with this material. →Being a tailor, he knows what to do with this material. 1.2、从句的主句主语与从句主语不同时，只要保留从句的主语，其它变化同以上1.1。 As he is still a child, you shouldn't be too hard on him. →He being still a child, you shouldn't be too hard on him. 1.3、当从句是否定句时，只要在being 前加否定词not ，其它变化同以上1.2。 As he was no tall enough, he couldn't reach for the apple. →No being tall enough, he couldn't reach for the apple. 2、当从句的谓语动词是进行时态（现在进行时态或过去进行时态）时: 2.1、当从句主语与主句主语相同时，只要去掉从句中的引导词与主语并去掉助动词be保留现在分词即可。有时为了强调进行状态,亦在分词前保留being. While he was reading the book, he nodded from time to time. →While reading the book, he nodded from time to time 2.2、当从句与主句的主语不同时，除保留从句主语外，其他变化同以上2.1 When he was giving a telephone call, his wife was reading a novel. →He giving a telephone call, his wife was reading a novel 2.3、当从句是含not的否定句时，只要在being 前加否定词not ，其它变化同以上1.1与2.2 As Tom is not working in his office, No one receives the telephone. →Tom not working i n his office, no one receives the telephone. 3、当从句中的谓语动词为一般时态(一般现在时与一般过去时)的实义动词时： 3.1、当从句主语与主句主语相同时，只要去掉从句主语并将实义动词改为现在分词即可Look round when you cross the street. →Look round when crossing the street. 3.2、当从句与主句的主语不同时，只要保留主语，其他变化同以上3.1 When they left the airport, we waved again and again to them. →They leaving the airport, we waved again and again to them. 3.3、当从句是含not的否定句时，只要在现在分词前加not，其他变化同以上3.1与3.2 As he didn't know anything about the accident, he went to work as usual. →.Not knowing anything about the acc ident, he went to work as usual. 4、当从句的谓语动词是一般时态(一般现在时与一般过去时)的被动态时： 4.1、当从句主语与主句主语相同时，只要去掉从句中的连词与主语并去掉be保留过去分词即可。 As the teacher was surrounded tightly by a group of students, he couldn't get away. →Surrounded tightly by a group of students the teacher cou ldn't get away. 4.2、当从句与主句的主语不同时，只要保留主语，其他变化同以上4.1 A. As the car was trapped in the sand, we had to go for help. →The car trapped in the sand, we had to go for help. 4.3、当从句是含not的否定句时，只要在过去分词前加not外，其他变化同以上4.1与4.2 As he was not killed dead in the field, he escaped at the very night. →Not killed dead in the field, he escaped at the very night. 5、当从句的谓语动词是完成时态(现在完成时与过去完成时)时：