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1、英语语法专项之状语从句1.时间状语从句2.条件状语从句3.原因状语从句4.结果状语从句5.比较状语从句6.目的状语从句7.让步状语从句8.地点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。根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。各类状语从句连接词（短语）一览表：时间when,while,as,assoonas,since,until,after,before，aslongas（长达之久）条件If,unless,as/solongas(只要)原因As,because,since，as/s
2、olongas(既然,因为)地点Where目的Sothat(为了),inorderthat结果Sothat（方便）,sothat,suchthat让步though,although,evenif,however方式As比较than,(not)asas1.时间状语从句时间状语从句常见的从属连词有：(注意其汉语意义)when,while,as,before,after,since,until(till)onceassoonas,themoment,theminute,immediately,directly,each/everytime,thefirsttime,thelasttime,nextt
3、ime,bythetime,whenever等。例如：Every/EachtimeIwasintrouble,hewouldcometomyhelp.IthoughtherniceandhonestthefirsttimeImether.注意：（1）when,while,as的区别：1)when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。如：WhenIgottotheairport,theplanehadalreadytakenoff.（主先从后）（短暂性）WhenIlivedthere,IusedtogototheseasideonSunday
4、s.(同时)（持续性）Whenthemovieended,thepeoplewentback.（从先主后）2)while侧重主从句动作的对比，且从句的动词必须是持续性的。如：Whilewewerechattingshewaslookingatthetimetableonthewall3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。如：SometimesIwatchTVasIamhavingbreakfast4）when和while还可以是并列连词，意思分别是“就在这时”，“然而”。如：Iwashavingarestonthesofawhenthet
5、elephonerangTheyweresurprisedthatachildshouldworkouttheproblemwhiletheycouldnt.注：并列连词when常用与以下句型中：was/weredoingwhen（正在做突然）was/wereabouttodowhen（刚要做突然）was/wereonthepointofdoingwhen(刚要做突然)hadjustdonewhen.(刚一就)Hardly/Scarcelyhaddonewhen(刚一就)(2)before引导从句时,词义非常灵活，注意下列句子中的before的词义：1.BeforeIcouldgetinawo
6、rd,thetailorhadmeasuredme.(还没来得及就)2.Wehadntrunamilebeforehefelttired.(还没就)3.Wehadsailed4daysbeforewesawland.(才)4.Pleasewriteitdownbeforeyouforgetit.(趁还没就)(3)till(until)和nottill(until)1）till(until):主句谓语动词必须是持续性的，意思是“到为止“如：Heremainedtheretill/untilshearrived.2）nottill(until):主句谓语动词必须是短暂性的，意思是“直到才”如：Sh
7、ewontgotobedtill/untilhereturnshome.3）notuntil还有强调式和倒装式：强调句：Itisnotuntilhereturnshomethatshewillgotobed.倒装句：Notuntilhereturnshomewillshegotobed.(4)几个极易混淆的时间状语从句：1）Itwas+时间点+when（当的时候时间是）Itwas5amwhenwearrivedatthevillage.2）Itwas/willbe+时间段+before(没过就过了才)Itwas/willbetwoweeksbeforewemet/meetagain.3）Iti
8、s/hasbeen+时间段+since（自从以来有）Itis/hasbeen3yearssincewelastmet.突破点：一看be动词的时态，二看时间段还是时间点。注意：在“Itis/hasbeen+时间段+since”句型中，从句的动词必须是短暂性的，如果是延续性的动词，时间要从从句的动作结束时算起。如：Itis3yearssinceIsmoked.(我戒烟有三年了)补充：assoonas,immediately,directly,instantly,themoment,theminute,theinstant,nosoonerthan,hardly/scarcely.when.和onc
9、e这些从属连接词引导的从句都表示从句的动作一发生，主句的动作随即就发生，常译为“一就”。从句中一般时态代替将来时态。everytime,eachtime,nexttime,thefirsttime,anytime,allthetime等名词短语用来引导时间状语从句，表示“每当.，每次.；下次”等。1.Itwasquiet_thosebigtrucksstartedcomingthroughthetown.A.beforeB.afterC.untilD.unless2.Itseemedonlyseconds_theboyfinishedwashinghisface.A.whenB.beforeC
10、.afterD.evenif3.Hardlyhadhereachedtheschoolgate_thebellrang.A.whileB.whenC.asD.assoonas4.Weweretoldthatweshouldfollowthemainroad_wereachedthecentralrailwaystation.A.wheneverB.untilC.whileD.wherever5.Irecognizedyou_Isawyouattheairport.A.themomentB.whileC.afterD.once6.Hewasabouttogotobed_thedoorbellra
11、ng.A.whileB.asC.beforeD.when7._Ilistentoyouradvice,Igetintotrouble.A.EverytimeB.WhenC.WhileD.Until8._JohnwaswatchingTV,hiswifewascooking.A.AsB.AssoonasC.WhileD.Till9.Thechildrenranawayfromtheorchard(果园)_theysawtheguard.A.themomentB.afterC.beforeD.as10.NosoonerhadIarrivedhome_itbegantorain.A.whenB.wh
12、ileC.asD.than11.Severalweekshadgoneby_Irealizedthepaintingwasmissing.A.asB.beforeC.sinceD.when12.It_longbeforewe_theresultoftheexperiment.A.willnotbe;willknowB.is;willknowC.willnotbeknowD.is;know13.Whatwasthepartylike?-Wonderful.Itsyears_Ienjoyedmyselfsomuch.A.afterB.beforeC.whenD.since14.Thenewsecretaryissupposedtoreporttothemanagerassoonasshe_.A.willarriveB.arrivesC.isgoingtoarriveD.isarriving15._gotintotheroom_thetelephonerang.A.Hehardlyhad;thenB.Hardlyhadhe;whenC.Hehadnot;thenD.Nothad
