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1、语法专题复习（四）状语从句讲解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。 一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。现分别列举如下: 1I fell asleep when he was doing his exercises .他正作练习时我睡着了。（时间状语从句）3She always sings as she walks .她总是一边走一边唱。（时间状语从
2、句）4I waited until he had finished his work .我等到他做完活。（时间状语从句）5It was not long before he told me about this affair .不久，他就告诉我这件事。（时间状语从句）6He has worked very hard since he entered the factory 自从他进厂，工作一直很努力。（时间状语从句）1 时间状语从句常用引导词：when, as, while, as soon as, while, before, after, since , till, until特殊引导词：
3、the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner than, hardly when, scarcely when种类从属连词例 句说 明时whenwheneverWhen I came into the room, he was writing a letter.当我进屋时，他正在写信。We shall go there whenever we are free.我们什么时间有空，我们就去那里。when指的是“某一具体的时间”。whene
4、ver指的是“在任何一个不具体的时间”。间状whenI was walking along the street when suddenly someone patted me on the shoulder from behind.我正在街上走着，这时忽然有人从后面拍我的肩膀。when意为“这时”或“在那个时候”,可以看作是并列句,这种用法的when分句一般位于句末。whileWhile it was raining, they went out.while指“在某一段时间里”，“在期间”，while引导的动作必须是持续性的。语天下雨的时候，他们出去了。I stayed while he w
5、as away.他不在的时候我在。asShe always sings as she walks .as引导持续性动作，强从她总是一边走一边唱调主句和从句的动作同时发生。句beforeBe a pupil before you become a teacher.先做学生，再做先生。before译为在之前afterHe arrived after the game started.比赛开始后，他到了。till We waited till (until)he came back .我们一直等到他回来。如主句动词是持续性动作，常用肯定式，表示“直到为止”时until She didnt stop
6、working until eleven oclock .她到11点钟才停止工作。Until he had passed out of sight, she stood there.她站在那里看着，直到看不见他的身影。如主句动词是瞬间动词，常用否定式，表示“直才”“在以前不”,从句放在句首表示强调，一般用until间状since as soon asGreat changes have taken place in China since 1978.自从1978年以来中国发生了巨大的变化。As soon as I arrive in Shanghai, Ill write to you.我一到
7、上海就给你写信。状语从句在主句之前时一般用逗号与主句分开，如从句在主句之后则不必用标点符号。语从句hardlywhenno soonerthanI had hardly got home when it began to rain.我刚一到家，就下雨了。=Hardly had I got home when it began to rain.No sooner had we got to the station than the train left.我们刚到车站，火车就走了。Hardly had we begun when we were told to stop.我们刚开始就被叫停。har
8、dlywhen和no soonerthan的意义相当于as soon as,但只表示过去发生的事情，主句为过去完成时，从句为过去时，如hardly或no sooner位于句首时语气强，而且主句的谓语要用部分倒装。every time, by the time, the moment等Every time I travelled by boat, I got seasick.我每次乘船都晕船。The moment I heard the song, I felt cheerful.我一听到这首歌，就感到很愉快。Next time you come ,youll see him.下次你来的时候，就
9、会见到他。在时间状语从句中，不能用将来时或过去将来时，而要用现在时或过去时代替将来时。2 地点状语从句常用引导词：where特殊引导词：wherever, anywhere, everywhere地点状语从句wherewhereverWhere there is a will, there is a way.有志者，事竟成。Where there is water there is life.哪里有水，哪里就有生命。You are free to go wherever you like.你可以随意到你喜欢的任何地方去。Wherever you go, you must obey the la
10、w.无论你去哪都要遵守法律。where与wherever意义基本相同，但后者语气较强，多用于书面语。3 原因状语从句常用引导词：because, since, as, since特殊引导词：seeing that, now that, in that, considering that, given that, considering that, 原因状becauseI came back late yesterday because I was on duty.昨天我回来晚了，因为我值班。because用来回答why 的问题，语气最强一般放在主句之后语从句sinceSince everyon
11、e is here, lets begin our meeting.既然大家都到了，我们开始开会。since表示既然或全已知的理由,稍加分析即可表明的原因,多放句首asAs he didnt know much English, he looked up the word in the dictionary .由于他英语懂得不多，他在字典中查阅这个单词。从句常放在句首，说明原因，主句说明结果，常用于口语中。now that, seeing thatNow (that) the weather has cleared up, we can start our journey.鉴于天气已经晴朗，我
12、们可以启程了。Seeing (that) he was badly ill, we sent for the doctor.鉴于他病情严重，我们派人去请医生去了。seeing (that), now that 和since, as 意义相似，他们都有“鉴于某个事实”的意思，that可以省去。4 目的状语从句常用引导词：so that, in order that特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end that目的状语从句thatI shall write down
13、 your telephone number that I may not forget.我要把你的电话号码记下来，以免忘记。Well tell you the truth so that you can judge for yourself.我把真实情况告诉你，使你能自己作出判断。They worked harder than usual in order that they could finish the work ahead of time .他们比往常更加努力工作，为了能提前完成工作。Put on more clothes lest (= for fear that ) you sh
14、ould catch cold.多穿点衣服，以免患感冒。目的状语从句中常用情态动词may (might) can (could) ,should 等放在动词之前，从句往往放在主句之后，主从句之间不用任何标点符号so thatin order thatlest = for fear that5 结果状语从句常用引导词：so that, such that,特殊引导词：such that, to the degree that, to the extent that, to such a degree that,结果状so that sothatWe turned up the radio, so that everyone heard the news.我们把收音机的音量放大，大家都听到了新闻。He was so excited that he couldnt say a word.他十分激动，以致一句话都说不出来。so that前有逗号为结果状语从句。sothat的so后面跟形容词或副词。语从句suchthatHe gave such important reasons that he was excused.他
