1、状语从句状语从句状语从句用来修饰修饰谓语动词、其它动词、定语、状语或整个句子的从句叫做状语从句状语从句类别1.时间状语从句2.地点状语从句3.原因状语从句4.条件状语从句5.目的状语从句6.让步状语从句7.比较状语从句8.结果状语从句 时间状语从句when,while,as引导的时间状语从句 before和after引导的时间状语从句since引导的时间状语从句as soon as引导的时间状语从句till,until 引导的时间状语从句when,while（当.时候）when可与可与终止性终止性动词连用。动词连用。while只能与只能与延延续性续性 动动词连用词连用.(while有时还可以表
2、示有时还可以表示对比对比)It was raining hard _I got to school yesterday._he was doing his homework,the telephone rang。_my wife was reading the newspaper,I was watching TV.backwhenWhileWhileMy son likes to watch boxing games _ I would rather listen to music.While然而然而 as 一边一边as引导的动作是延延续性续性 的动作，一般用于主句和从句动作同时发生；as也
3、可以强调“一先一后”。正当他下公共汽车时,我看见了他 I saw him as he was getting off the bus.(as强调句中两个动作紧接着先后紧接着先后发生发生)backbefore和after引导的时间状语从句before引导的从句谓语用的是过去时过去时，则主句动词多用过去完成时过去完成时，这样以便体现动作发生的先后After表示主句动作发生在从句动作之后(时态情况与before相反）eg,读完中学后，他去了一家工厂上班。After he finished middle school,he went to work in a factory.Eg,我父亲恰好在信到之前
4、去加拿大了。My father had left for Canada just before the letter arrived.back=After middle school,he went to work in a factory.since引导的时间状语从句一般情况下，从句谓语动词用一般过去一般过去时，而主句的谓语动词用现在完成现在完成时。例句：自从你离开以来，我一直在北京了。I have been in Beijing since you left.It is/has been 时间since+一般过去时一般过去时 例句：我们老板离开北京有五个月了。It is five mont
5、hs since our boss left Beijing.back 提问_as soon as(一.就.)时间状语从句里，(1)主句用将来时将来时态时，从句用一般现在时一般现在时表示将来.(2)主从句都用过去时过去时.一到了纽约我会马上给你打电话Ill ring you up as soon as I get to New York.听到那个坏消息，他们马上赶往医院。They _to the hospital as soon as they _the bad news.hurriedheardbacktill(不用于句首)/until 直到.(1)如果主句用肯定式肯定式，其含义是“一直到时
6、”，谓语动词只能用延延续性续性 动词。eg,那个人读书直到灯灭。The man read till the light went out.Eg,一直等到雨停吧！Lets wait until the rain stops.(2)We _start _Bob comes._ get off _the bus stops.Jane _ stop crying _ her mum came back.主句谓语动词为非延续性动词 时，应用 not.until.wontuntilDontuntildidntuntil1）Ill ring you up _ I get to AmericaA.while
7、B.when C.as soon as D.since2）The children _ leave school _ the rain stopped yesterday 3）It _ ten years since they _ to France Aas；covered Bwas；have moved Cis；have moved Dis；moved 4）He _ wait until the rain _ Awont；will stop Bwont；stop Cwill；stops Dwill；will stop didntuntilDCbackC地点状语从句地点状语从句常常由where
8、来引导去你喜欢去的地方Go where you like.有志者事竟成Where there is a will,there is a way.back原因状语从句because因为since因为；既然now that既然 as因为；既然Because因为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。because和so(因此)不能同用在一个句子里。-Why are you late today?-Because I feel ill.because 与for 的区别becausebecause换用，两者不同
9、的是换用，两者不同的是forfor只能放主只能放主句后句后，不放句首：不放句首：他不可能看到了我，因为我当时不在那儿。他不可能看到了我，因为我当时不在那儿。He couldnt have seen meHe couldnt have seen me，for for becauseI was not therebecauseI was not there as,since和now that 既然as引导的原因状语从居多放在句首句首,中间逗号隔开,表示明显的原因。Since/now that 通常放在句首句首,表示明显的或众所周知的原因._we have no money,we cant buy
10、it._ he has no car,he cant get there easily._ all the students are here,why dont we start at once?A.As soon as B.as C.now that D.whenbackSinceAs C if 引导的条件状语从句1)主句是将来时从句用一般现在时表将来I_(help)you with your English if I _(be)free tomorrow.2)“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 youll be late.=
11、If you dont hurry up,youll be late.Study hard and you will pass the exam.=If you study hard,you will pass the exam.will helpamunless(除非/如果不)引导的条件状语从句unless在意义上相当于ifnot。除非你努力学习，否则你会失败。You will fail unless you study hardYou will fail if you _study hardIf Bobby doesnt work hard,hell fail in the exam._
12、Bobby_ hard,hell fail in the exam.Unless worksdont 1）He will go to the Great Wall if it _ tomorrow Awont rain Bdoesnt rain Cdont rain Disnt raining 2）_ you eat bad food，you may be ill ABefore BWhy CIf DWhich BC3).Put on your coat，or youll catch a cold B：_ you _ put on your coat，youll catch a cold.If
13、dontback目的状语从句目的状语从句通常由 so that,in order that引导Eg,为赶上第一班车我们很早就出发了。We started early so that we could catch the first train.backso that既可引导目的状语从句，又可引导结果状语从句。1)目的状语从句里往往带有情态动词can,could,may,might等。2)目的状语从句往往表示的目的很明确。常和in order to/so as to转换.Li Pin got up early so that he could catch the bus.Li Pin got u
14、p eatly _ the bus.in order to catch让步状语从句让步状语从句通常由although,though等连词引导。Though he is young,he knows a lot.although(though)不能与but 用在同一个句子中。Though it was raining hard,but he still went out.Though it was raining hard,he still went outIt was raining hard,but he still went out.back比较状语从句as原级as一样；not as so
15、 原级as不如我不如康丽跑得快。I dont run asso fast as Kang Li(does)比较级+than超过，从句中常省略意义与主句相同的部分Tom runs faster than John（does）back结果状语从句结果状语从句由sothat,suchthat,so that引导。sothat语such.that可以互换。so是副词，修饰形容词或副词。其结构是:“.so+形容词（副词）+that+从句”。例如：He was so glad that he couldnt say a word.such是形容词，它修饰的可以是单数或复数可数名词，也可是不可数名词；名词前
16、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 _a(hot)day that nobody wanted to do anything.suchso that/such that 两种结构是可以互换的It is such an important match that nobody wants to miss it.=The match is _由many,much,little,few等词修饰时，只能用so,不用such。He has _little time that he cant go to the cinema with you.so impo
17、rtant that nobody wants to miss it.so2考例：1）I cant understand this passage _ there are no new words in it Aif Bbecause Cthough Dand 2）“Why did Li Lei use a pencil？”“_ his pen was broken”ABecause BWhen CUntil DIf 3A：The box is so heavy that the boy couldnt carry it B：The box is _ heavy_ the boy to car
18、ryCAtoo for4Mike wants to know if _ a picnic tomorrow YesBut if it _ ，well visit the museum instead Ayou have；will rain Byou will have；will rain Cyou will have；rains Dwill you have；rains 5Do you know when he _ back tomorrow？Sorry，I dontWhen he _ back，Ill tell you Acomes；comes Bcomes；will come Cwill
19、come；comes Dwill come；will come CC是否是否如果如果两句连成一句1.He didnt come.He was ill._2.He is too young to join the army._3.He studies English hard.He is over seventy._4.We will stay at home.It rains._becauseHe is so young that he cant join the army.He is not old enough to join the army.Although/thoughif5.He
20、was doing his homework.Someone knocked at the door._6.I waited.He came back._7.He is tall.I am tall._8.My mother was cooking.I was listening to the news._9.It was a hot day.We couldnt sleep well._10.He came into the warm room.He took off his cap and sat down._whenI waited until/till he came back.He is as tall as me.whileAs/SinceAs soon as
