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1、1.时间状语从句：引导时间状语从句的连词有：when,while,as,themoment,before,after,till,until,since,assoonas等。请注意when,while,as的区别1.while引导的动作必须是持续性的，在……期间，往往指一段时间。如：Whileweweretalking,hecamein.Pleasedon’ttalksoloudwhileothersareworking.2.while作为并列连词，意为“而，却”，侧重主句动作和从句动作相对比。Wearecleaningthe
2、classroomwhiletheyareplayingthefootball.连接词while的用法小结连接词when,while,as的用法区别：1．while引导的时间状语从句的谓语动词必须是可延续的，而when引导的时间状语从句的谓语动词是可延续的，也可以是表短暂性动作的动词。如：When/Whilehewaseatinghisbreakfast,heheardthedoorbellring.WhenIstoppedmycar,amancameuptome.2．表示“随着……”，连词用as，不用when或while。
3、如：Asthedaywenton,theweathergotworse.3.从句动作发生在主句动作之前时，只能用when引导这个从句，不可用as或while。如Whenyouhavefinishedyourwork,youmayhavearest.Whenthechildrenhadgonetobed,shebegantoprepareherlessons.（这个时候的when=after）2.－Whydidn’tyoutellhimaboutthemeeting?－Herushedoutoftheroom____Icoul
4、dsayaword.A.beforeB.untilC.whenD.after3.Itisalmostfiveyears______wesaweachotherlasttime.A.beforeB.sinceC.afterD.becausetill,until和not…until：1.意为“某动作一直延续到某时间点才停止”。如：Wewaiteduntilhecame.2．用于否定句时，意为“某动作直到某时间才开始”。如：Hewon’tgotobedtill/untilshereturns.3．till不可以置于句首，而unti
5、l可以。如：UntilyoutoldmeIhadnoideaofit.Themeetingdidn’tstart_____everyonewashere.A.becauseB.whileC.ifD.untilIwon’tbelieveyou____Ihaveseenitwithmyowneyes.A.beforeB.untilC.afterD.when2.条件状语从句引导状语从句的连接词有:If,unless,aslongas,incase,providedthat,onconditionthatUnless---如果不,除
6、非=ifnotWecan’tgetthereontimeunlesswebooktheearliestflight=Wecannotgetthereontimeifwedon’tbooktheearliestflight.Hewillnotjoinusunlesshechangeshismind.Where---在……地方Putthemedicinewhereyoucaneasilygetit.Wherethathighbuildingstands,thereusedtobesomelow,desertedhouses.Wh
7、erethereisawill,thereisaway.1.Itwon’tbelong________youregretwhatyousaid.A.sinceB.whenC.beforeD.till2.______thedaywenton,theweathergotworse.A.WithB.SinceC.WhileD.As3.IwaswatchingTV_______suddenlythelightswentout.A.whenB.whileC.asD.for4.--Whatwasthepartylike?--Wonder
8、ful.It’syears____Ienjoyedmyselfsomuch.A.afterB.whenC.beforeD.since5.___________hecomes,wewon’tbeabletogo.A.WithoutB.UnlessC.ExceptD.Even4.原因状语从句b
