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状语从句状语从句在句中起状语作用，可修饰主句中的动词、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、地点等九种。
这些状语从句中学课本均有涉及，掌握其用法对我们学好主从复合句非常重要。
一、.时间状语从句。
常用的引导词有when, while, as, as soon as, before, after, since, until( till )等。
2. 时态呼应。
多数时间状语从句和主句的时态呼应比较明显，容易掌握。
这里只说两点：其一，状语从句用一般现在时表将来。
如：She will get married when she meets the right man。
其二，在表“刚……就……”的句型hardly …when 和no sooner …than中，主句常用过去完成时，从句常用一般过去时，如果否定词置于句首，主句可用倒装结构。
如：Hardly had I entered the room when I heard a loud noise.3. when 和while 的选择。
when 既可引导“点”时间，也可引导“段”时间。
而while 只能引导“段”时间。
如：While I was reading she came in. ( 段时间，while 可换成when )/ When the clock struck twelve, all the lights went out. (点时间，只能用when)。
4. until ( till ) 的用法。
这两个词一般可互换，但until 语气较强，可置于句首。
另外还要注意，当主句的动词是延续性动词，要用肯定形式，表“到……为止”。
如：Wait until he comes . 当主句动词为终止性动词，要用否定形式，表“直到……才……”。
如：Don'tleave until he comes.since 的难点。
中考初三英语状语从句专题复习用来修饰主句中的动词，形容词或副词等而充当状语的从句叫做状语从句。
状语从句常用从属连词来引导，与主句连接起来。
若置于句末，则前面不加逗号。
根据意义和作用，状语从句可分为时间原因条件等几种。
下面我们就来分析一下这几种状语从句。
1时间状语从句时间状语从句常用从属连词when,after,until,as soon as,等来引导。
当主句是祈使句或谓语动词是一般将来时态或情态动词时，其时间状语从句中的谓语动词常用一般现在时态表示将来发生的动作或存在的状态。
这就是我们常说的“主将从现”。
如：Please call me when you get there.当你到那时，请给我打个电话。
I will write to you as soon as I arrive in Beijing.我一到北京就给你写信。
<温馨提示>since引导时间状语从句表示“自从…以来”，从句中的动词一般表示动作的起点，用过去时;而主句的动作延续的情况则用一般现在时或现在完成时。
常用的句型为：It has been/is+一段时间+since+过去时。
如：I has been/is three years since we met last time.自从我们上次见面，已经三年了。
2条件状语从句引导条件状语从句的连词或词组有：if(如果),unless(除非),as long as(只要)等。
如果主句是将来时，条件状语从句也用一般现在时来表示。
如：I will stay at home if it rains tomorrow.如果明天下雨，我就待在家。
You can’t learn English well unless you work hard.除非你努力学习，否则是学不好英语的。
<温馨提示>由if引导的条件状语从句，若从句表达的是与现在事实相反的事实，则常用虚拟语气，即用过去时态表示(如果涉及到be动词，一律都用were)。
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。
中考英语专项复习：状语从句归纳一、时间状语从句引导时间状语从句的连词有before、after、when、while、since (自从……)、till/until (到……为止)、as soon as (一……就……)、whenever (每当；任何时候)等。
1. 当主句是将来时或祈使句时，在before、after、when、till/until、as soon as等引导的从句中，用一般现在时。
如：I will call you as soon as I get to Beijing. 我一到北京，就给你打电话。
2. when引导的从句中，谓语动词可以是延续性动词，也可以是短暂性动词；while引导的从句中，谓语动词必须是延续性动词。
如：Things were different when I was a child. 我小时候的情况与现在不同。
I will visit my parents when I have time.我有空时会去看望我的父母。
I was reading a book while he was watching TV. 当他在看电视的时候，我在看书。
3. 当时间状语从句由since连接时，主句应用现在完成时，从句用一般过去时。
如：They have been friends since they were at primary school. 他们从小学起就一直是好朋友。
4. 一般情况下till和until两者可以互换，但till不能放于句首。
结构如下：延续性动词+till/until...。
如果主句中的谓语动词是短暂性动词，该动词就要用否定形式，形成“not...till/until”结构，意为“直到……才……”。
如：Walk till / until you see a white house. 一直走到你看到一座白房子为止。
I didn’t go to bed until I finished my homework. 直到做完家庭作业，我才上床睡觉。
中考英语常考状语从句1.时间状语从句When/while/as, since, as soon as, until/till, before, after，once, by the time, the minute/ the moment(一...就...), every/each time, whenever,...(1) When & while &as①When:表示“当...时”，后面跟时间点、时间段均可，因而从句的动词可以是非延续性动词(又叫短暂性动词)或延续性动词。
例如：He was watching TV when his mom came back.当他妈妈回来时，他正在看电视。
When his mom was cooking, he was watching TV.当他妈妈做饭的时候，他正在看电视。
②While:表示“当..时”，后面只能跟时间段，因而从句的动词也只能是延续性动词，且常为进行时态（现在进行时或过去进行时）。
例如：While his mom was cooking, he was watching TV.当他妈妈做饭的时候，他正在看电视。
③as:表示“一边...一边...”【注意】与while区分：当一个人同时进行两个动作时(即主从句的主语是同一个人时)，只能用as。
还可表示“随着...”。
例如：Tom sings as he works. Tom一边唱歌一边工作。
As time went by, I learned how to be strong.随着时间的流逝，我学会了如何变得坚强。
(2) until & till (介词/连词)until:表示“直到...”，表示某个动作或状态一直持续到...为止。
例如：They waited until/till their mom came back.他们一直等到妈妈回来。
（主句谓语动词为延续性动词）“not...until”表示“直到...才”。
第十七章状语从句知识点1状语从句的分类知识点2时间状语从句的用法知识点3地点状语从句和条件状语从句的用法知识点4原因状语从句和让步状语从句的用法知识点5比较状语从句和方式状语从句的用法知识点6目的状语从句和结果状语从句的用法知识详单知识点1状语从句的分类知识点2时间状语从句的用法知识点3地点状语从句和条件状语从句的用法知识点4原因状语从句和让步状语从句的用法知识点5比较状语从句和方式状语从句的用法知识点6目的状语从句和结果状语从句的用法考点突破考点1考查时间状语从句的用法1.(龙东中考)-Henry, please call us as soon as you _______ Hawaii.-OK. I'll do that, Mom.A. arrive inB. are arriving inC. will arrive at【解析】选择A as soon as结构意为“一……就……，”引导时间状讲从句，主句为祈使句，从句用一般现在时表示将来。
Hawaii 为大地点.因此用in.考点2考查地点状语从句的用法2.(扬州中考)-My friend has achieved his goal after years of hard work.--- Great.A·One tree can make a forest B. Where there is a will，there is a way C. Many hands make light work D. A friend in need is a friend indeed【解析】选B 第一个人阐述自己的朋友经过多年努力实现目标.，第二个人表示祝贺，同时，发表自己对此事的看法。
应该是“有志者，事竟成”.该句是where引导的地点状语从句。
考点3考查条件状语从句的用法3.(十堰中考)_________ deal with our problems, we can easily become unhappy.A. UntilB. IfC. UnlessD. Though【解析】选C。
中考九年级英语状语从句专题复习含答案解析一、初中英语状语从句1．We’ll go to the farm and help the farmers with the apple-picking if it ______tomorrow. A．isn’t rain B．will be rainy C．doesn’t rain D．is raining【答案】C【解析】【详解】句意：如果明天不下雨我们将会去农场帮农民摘苹果。
考查条件状语从句。
根据题干We’ll go to the farm and help the farmers with the apple-picking if it ______tomorrow.可知，if引导的条件状语从句，主句用将来时，从句需用一般现在时，句意是“明天不下雨”，rain是实意动词，主语是it，变否定用助动词doesn’t。
故选C。
【点睛】主将从现是指在时间状语从句和条件状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。
常见的有以下四种情况：一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时如： When I gro w up, I’ll be a nurse and look after patients我长大后要当一名护士，照顾病人二、如果主句是祈使句，那么从句通常要用一般现在时如：Don’t laugh at me when I make a mistake.我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时如：You should be quiet when you are in the reading room在阅览室时应保持安静四. 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to....如; She said not to close the window常见的时间状语从句的连词有：as soon as,when,while ,as,until等2．I have to leave now __ I can catch the last bus.A．so that B．because of C．until D．as soon as【答案】A【解析】试题分析：so that以便，所以；because of因为，由于；until直到；as soon as一……就……。
状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。
1.时间状语从句(1)时间状语从句常用 when, as, while, before, after, since, till, until, as soon as等连词来指引。
It was raining hard when got to school yesterday.While he was doing his homework, the telephone rang.As he walked along the lake, he sang happily.He had learned a little Chinese before he came to China.After he finished middle school, he went to work in a factory.(2)在时间状语从句里，往常不用未来时态，用此刻时态表示未来的动作或状态。
I’ll ring you up as soon as I get to New York.I will tell him everything when he comes back.He won’tbelieve it until he sees it with his own eyes.(3)在带有 till 或 until 指引的时间状语从句的主从复合句里，假如主句用一定式，其含义是“向来到时”，谓语动词只好用持续性动词。
假如主句用否认式，其含义是“直到才”, “在从前不”, 谓语动词可用瞬时动词。
The young man read till the light went out.Let’s wait until the rain stops.We won’tstart until Bob comes.Don’tget off until the bus stops.2.条件状语从句(1)条件状语从句往常由if, unless 指引。
状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。
1. 时间状语从句(1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。
It was raining hard when got to school yesterday.While he was doing his homework, the telephone rang.As he walked along the lake, he sang happily.He had learned a little Chinese before he came to China.After he finished middle school, he went to work in a factory.(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。
I’ll ring you up as soon as I get to New York.I will tell him everything when he comes back.He won’t believe it until he sees it with his own eyes.(3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。
如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。
The young man read till the light went out.Let’s wait until the rain stops.We won’t start until Bob comes.Don’t get off until the bus stops.2. 条件状语从句(1)条件状语从句通常由if, unless引导。
What shall we do if it snows tomorrow?Don’t leave the building unless I tell you to.(2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。
I’ll help you with your English if am free tomorrow.He won’t be late unless he is ill.(3)“祈使句+ and (or)+ 陈述句”在意思上相当于一个带有条件状语从句的复合句。
Hurry up, or you’ll be late.=If you don’t hurry up, you’ll be late.Study hard and you will pass the exam.=If you study hard, you will pass the exam.3. 原因状语从句(1)原因状语从句通常由because, since, as引导。
He didn’t come to school because he was ill.As it is raining, we shall not go the zoo.Since you can’t answer the question, I’ll ask someone else.(2)because表示直接原因，语气最强。
Because引导的原因状语从句多放在主句之后。
回答由why提出的问题，只能用because。
As和since语气较弱，一般用来表示明显的原因。
由as和since引导的原因状语从居多放在句首。
------Why aren’t going there?------Because I don’t want to.As he has no car, he can’t get there easily.Since we have no money, we can’t buy it.(3)because和so不能同用在一个句子里。
4. 结果状语从句(1)结果状语从句由so…that, such…that, so that引导。
He is so poor that he can’t buy a bike for his son.She is such a good teacher that everybody likes her.My pencil fell under the desk, so that I couldn’t see it.(2)so…that语such...that可以互换。
在由so...that引导的结果状语从句中，so是副词，与形容词连用。
其结构是: “...so + 形容词（副词）+ that + 从句”。
He was so glad that he couldn’t say a word.The hall is so big that it can hold 2,000 people.Mother lives so far away that we hardly ever see her.在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；名词前面可以带形容词，也可不带。
如果是单数可数名词，前面需加不定冠词a或an。
It was such a hot day that nobody wanted to do anything.He had such long arms that he could almost touch the ceiling.He made such rapid progress that he did very well in the mid-term.有时上述两种结构是可以互换的。
例如：It was such a wonderful film that all of us wanted to see it again.=The film was so wonderful that all of us wanted to see it again.It is such an important match that nobody wants to miss it.=The match is so important that nobody wants to miss it.(3)如果名词前由many, much, little, few等词修饰时，只能用so, 不用such。
Soon there were so many deer that they ate up all the wild roses.He has so little time that he can’t go to the cinema with you.5. 比较状语从句比较状语从句通常由as…as, 比较级+ than…等连词引导。
例如：Tom runs faster than John does.This classroom is as big as that one.6. 目的状语从句(1)目的状语从句通常由so that, in order that引导。
例如：We started early so that we could catch the first train.He studies hard so that he could work better in the future.We used the computer in order that we might save time.(2)so that既可引导目的状语从句，又可引导结果状语从句。
区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can, could, may, might等。
2)从意思上看，目的状语从句往往表示的目的很明确。
例如：Speak clearly so that they may understand you. (目的状语从句)Jack is badly ill so that he has to rest. (结果状语从句)7. 让步状语从句(1)让步状语从句通常由although, though等连词引导。
例如：Though he is young, he knows a lot.Although I am tired, I must go on working.(2)although(though)不能用在同一个句子中。
例如：我们不能说：Though it was raining hard, but he still went out.应该说：Though it was raining hard, he still went out.或It was raining hard, but he still went out.8. 地点状语从句地点状语从句常常由where来引导。
例如：Go where you like.Where there is a will, there is a way.【实例解析】1. You will stay healthy _______ you do more exercise, such as running and walking.A. ifB. howC. beforeD. where2. ---Shall we go on working?---Yes, _________ I prefer to have a rest.A. whenB. ifC. becauseD. though3. None of us knew what had happened _________ they told us about it.A. whenB. untilC. afterD. though4. ---I hope you’ll enjoy your trip, dear!---Thank you, mum. I’ll give you a call _________ I get there.A. untilB. as soon asC. sinceD. till【中考演练】一. 单项填空1. _______ he’s old, he can still carry this heavy bag.A. ThoughB. SinceC. ForD. So2. ---Do you know if he _______ to play basket ball with us?---I think he will come if he ______ free tomorrow.A. comes; isB. comes; will beC. will come; isD. will come; will be3. In the zoo if a child _____ into the water and can’t swim, the dolphins may come up ______ him.A. will fall; to helpB. falls; to helpC. will fall; helpD. falls; helping4. I don’t remember ________ he worked in that city when he was young.A. whatB. whichC. whereD. who5. We will stay at home if my aunt ________ to visit us tomorrow.A. comesB. comeC. will comeD. is coming6. The police asked the children _______ cross the street ________ the traffic lights turned green.A. not; beforeB. don’t; whenC. not to; untilD. not; after7. I was late for class yesterday _______ there was something wrong with my bike.A. whenB. thatC. untilD. because8. I’ll go swimming with you if I ________ free tomorrow.A. will beB. shall beC. amD. was9. In the exam, the ________ you are, ______ the _______ mistakes you will make.A. careful; littleB. more careful; fewestC. more careful; fewerD. more careful; less10. You should finish your lessons _______ you go out to paly.A. beforeB. afterC. whenD. while11. I hurried _____ I wouldn’t be late for class.A. sinceB. so thatC. as ifD. unless12. When you read the book, you’d better make a mark _______ you have any questions.A. whichB. thatC. whereD. though13. The teacher raised his voice _______ all the students could hear him.A. forB. so thatC. becauseD. in order14. He took off his coat _______ he felt hot.A. becauseB. asC. ifD. since15. It is ______ that we’d like to go out for a walk.A. a lovely dayB. too lovely a dayC. so lovely a dayD. such lovely a day16. Mary had ______ much work to do that she stayed at her office all day.A. suchB. soC. tooD. very17. _______ I felt very tired, I tried to finish the work.A. AlthoughB. BecauseC. AsD. As if18. ______ the day went on, the weather got worse.A. WithB. SinceC. WhileD. As19. ______ well you can drive, you must drive carefully.A. So long asB. In order thatC. No matter howD. The moment20. Write to me as soon as you ________ to Beijing.A. will getB. getC. gettingD. got二. 根据中文意思完成下列英语句子1. 不管他跟我开什麽玩笑，我都不生气。
