原因状语从句和目的状语从句
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原因状语从句Company number:【WTUT-WT88Y-W8BBGB-BWYTT-19998】二、原因状语从句:1、定义:在句中用来说明主句原因的句子叫原因状语从句。
2、常用引导词: because(因为), as (由于), since (既然), now (that) (既然)3、时态:原因状语从句一般都是根据实际情况选用适当的时态。
通常是主过从过,主现从现。
4、because, since和as的区别:1) because引导的原因状语一般放于主句的后面,because从句位于句首时要用逗号分开,放在句末时,可不用逗号分开。
because表示直接原因,语气最强,最适合回答why引导的。
because of 也表示原因,但它后面不接从句, 只能接名词, 代词或动名词。
注意:because 和so 不可同时出现在一个句子里。
①I do it because I like it. = I like it so I do it.②We went by bus because it was cheaper. = It was cheaper so we went by bus.③ He can’t go to school because of his illness.2) since引导的原因状语一般放于主句之前表示已知的、显然的理由(通常被翻译成“既然”= now that ),较为正式,语气比because弱。
①Since you are free today, you had better help me with my mathematics.②Since you don't trust him, you should not employ him.③Now (that) you are grown up, you should not rely on your parents.3) as引导原因状语时表示附带说明的“双方已知的原因”,含有对比说明的意味,语气比since弱,较为正式,位置较为灵活(常放于主句之前)。
状语从句知识点详解(初中英语专项复习)状语从句的概念: 用一个句子作状语来修饰动词和形容词,以表明动作发生或状态存在的时间、地点、原因等,这个句子就叫做状语从句。
状语从句的分类:状语从句共分为九大类,包括:时间、地点、原因、条件、让步、目的、结果、方式、比较状语从句。
下面分别讲解:一、时间状语从句概念:用来表示时间的状语从句,由when, while, as, till, until,before, after, since等引导。
由于时间状语从句的引导词所表示的意思并非一致,不同引导词表达不同的时间,它们在句子中对应的时态、语态等也有所不同。
例如:when /while引导的时间状语从句when引导的从句的谓语动词通常是瞬间动词,也可以是延续性动词。
从句动作可与主语动作通常先后发生也可同时发生。
I was writing when my sister came back.( come是瞬间动词,只能用when引导,不能用while)He often wrote me when/while he studied in Shanghai International Studies University.( study 是延续性动词,while可代替when)While my mother was cooking , I was playing chess with dad. (cook是延续性的动词,cook和play同时发生)I like playing chess while my sister likes reading stories.我喜欢下棋,而我姐姐喜欢看小说。
(while表示对比)when和while的区别还有:while引导的时间状语从句多用于进行时态,而when引导的时间状语从句多用于一般时态。
While we were playing games, our headmaster called me .我们正在做游戏的时候,校长叫我了。
在初中英语中,主要有三大从句,即宾语从句、定语从句、状语从句(包括时间、条件、结果、目的、原因、让步、地点、方式等)。
小编今天跟大家分享的就是这三个从句的主要语法点,赶快看起来吧!宾语从句一、定义在句子中起宾语作用的从句叫做宾语从句。
二、连接词that: I think that you can pass the exam.Whether/if: I don’t know what the word means.“Wh”: I don’t know what the word means.I don’t know where he found the book.只用whether的情况:1. 与or not连用:I don’t know whether it’s raining or not.2. 与动词不定式连用:He doesn’t know whether to accept the invitation.3. 连接词前有介词时:It depends on whether he is coming.三、时态1. 主句是一般现在时态,从句根据实际情况而定(各种时态均可)She wants to know what he has done for the exam.2.主句是一般过去时态,从句用相应的过去的时态。
1)She said that she was a student.2)She said that she would fly to Japan in a week.3)She said that she had finished her homework already.3. 如果宾语从句说的是客观真理、自然现象或事实时,这时宾语从句要用一般现在时态。
The teacher said that the earth goes round the sun.一、定义在复合句中修饰名词、代词的从句叫定语从句。
状语从句本质——用不同的连接词将主句与一个或几个分句连接起来,以表达主句与分句之间的逻辑关系。
主句分句连接词逻辑关系时间、地点、原因、目的、结果、条件、让步、比较、方式时间状语从句用来说明主句动作与从句动作发生时间上的先后关系类型常用连接词特殊连接词重点时间状语从句when, while, as, before,after, since, till, until,as soon as 名词:the moment, theinstant, the minute, theday, next time, everytime副词:instantly,immediately, directly 连词:no sooner …than,Hardly…when, scarcely …when 主句从句的时态搭配,延续性动词与非延续性动词的区别1. when 引导的时间状语从句可以理解为“当……的时候”时态搭配主从句都是过去时态主从句都用现在时态主句将来时态从句现在时态辨析The performer will already have played the music when we get there.The performer will be playing the music when we get there.是否可以用while 来替换?It is challenging for a company to remain inter-nationally competitive while the global economics are receding.※when, while, as 用法的区别when 相当于at that time ,引导的状语从句中谓语动词可以是延续性的也可以是非延续性的while ,as 相当于during that time, 引导的状语从句中谓语动词通常是延续性的随着英特网变得日益商业化,网络的使用对商人们非常有利。
中考复习之状语从句以及句子成分状语从句语法要点在句子中起状语作用的从句叫做状语从句(也称副词性从句),它相当子副词或副词短语,修饰主句的动词、形容词、副词等。
状语从句一般可以分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句等。
一、时间状语从句在句子中起时间状语作用的从句被称之为时间状语从句。
时间状语从句可以放在句首、句中和句尾。
用于引导时间状语从句的连词主要有when,while,as,as soon as,before, after,since,once,till,until,whenever等。
I studied English when (while,as) I was young.我小时候就开始学英语。
I have learned many things since I left my hometown.离开家乡后,我学到了很多东西。
He wants to become famous after he publishes his works.他希望他的作品出版后能成名。
He didn't come into the room until I came back.直到我回来,他才进屋。
二、地点状语从句在句子中起地点状语作用的从句被称之为地点状语从句。
地点状语从句可以放在句首和句尾。
用于引导地点状语从句的连接词有where,wherever等。
Where there is a will,there is a way.有志者事竟成。
I will follow you wherever (anywhere,no matter where) you go.你到哪儿,我就跟到哪儿。
Wherever you go, you must remember that you are a Chinese.无论你到哪里,你都得记住你是一个中国人。
八种状语从句状语从句在句中作状语,修饰主句中的动词、形容词和副词等。
按其作用和意义可分为时间、原因、目的、结果、条件、让步、方式、比较八种。
下面对这八种从句的要点加以总结。
一、各类状语从句的引导词及易混词的区别。
1. 时间状语从句1) 引导词(1)表示“当……时候”:when, while, as, whenever(2)表示“一……就……”:as soon as(3)其它:after, before, since, until, by the timeWhenever he comes, he brings a friend. 他每次来都带个朋友。
I want to see him as soon as he arrives. 他一来我就要见他。
I went to bed after I finished my homework. 我做完家庭作业之后才睡觉。
2) 易混引导词when, while, as 的区别when既可指“时间点”,与瞬时动词连用,也可指“时间段”,与延续性动词连用(这时可与while互换)。
如:When he came in, his mother was cooking. 他进来时,他妈妈正在烧饭。
When(While)we were at school, we went to the library every day. 我们在校求学时,每天都到图书馆去。
while 只表示时间段,因此while从句的谓语动词要用延续性动词。
Please don' t talk so loud while others are talking. 别人在工作时,切勿大声讲话。
as 与when 用法相似,但着重强调主句动作与从句动作同时发生,有“随着……”或“一边……一边……”之意。
She sang as she went along. 她边走边唱。
As you get older, you get more knowledge.随着年龄的增长,你获得的知识就越多。
一、复习预习状语从句指句子用作状语时,起副词作用的句子。
它可以修饰谓语、非谓语动词、定语、状语或整个句子。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。
状语从句一般由连词(从属连词)引导,也可以由词组引起。
从句位于句首或句中时通常用逗号与主句隔开,位于句尾时可以不用逗号隔开。
二、知识讲解知识点:【考查点1】原因状语从句是用来说明引起主句这个结果的原因的从句,在初中阶段引导原因状语从句的从属连词主要的有because, as, since,for,seeing (that), now (that), considering (that),in that等:The woolly shrank because it was washed badly. 毛衣因洗得不得法而缩水。
I can’t get to sleep because of the noise outside. 由于外面声音嘈杂我睡不着。
Since [As] we’ve no money, we can’t buy it. 由于我们没钱,我们无法购买它。
Seeing that it’s raining, we’d better stay indoors. 既然外边在下雨,我们最好待在室内。
Now that you are here, you’d better stay. 你既然来了,最好还是留下吧(既来之,则安之)。
【注】除以上提到的大家比较熟悉的引导原因状语从句的从属连词外,when有时也可引导原因状语从句(when表示“既然”)I won’t tell you when you won’t listen. 既然你不想听,我就不告诉你了。
原因状语从句应注意的问题1、because , since , as , for,辨析1)because语势最强,用来说明人所不知的原因,回答why提出的问题。
当原因是显而易见的或已为人们所知,就用as或since。
状语从句知识讲解基本概念定义:在复合句中由从句表示的状语称作状语从句,它可以用来修饰谓语(包括非谓语动词)、定语或状语,或是整个句子。
状语句通常由一个连词引起,也可以由一个起连词作用的词组引起,有时甚至不需要连词直接和主句连接起来。
状语从句一般分为九大类状语从句类别时间状语从句地点状语从句原因状语从句目的状语从句结果状语从句条件状语从句方式状语从句比较状语从句让步状语从句一、时间状语从句1.when, while和as1) when既可引导一个持续动作,也可引导一个短暂动作,可用于主句和从句动作同时发生或从句动作先于主句动作。
如:When I lived there, I used to go to the seashore on Sundays.When the film ended, the people went back.2)while引导的从句的谓语动词动作必须是持续的,侧重主句动作和从句动作相对比,同时while引导的从句一般用进行时。
如:While I was wondering at this, our schoolmaster took his place.3) as引导一个持续性动作,多用于主句和从句动作同时发生。
如:He hurried home, looking behind as he went.John sings as he works.4) when还可用作并列连词使用,其意义是“那时、这时”,相当于and this/that time.常用于下列句式:Somebody was doing someth ing when…Somebody was about to /going to do something/ on the point of doing sth. when…Somebody had just / hardly done something when…过去时此外when还表示原因“既然”。