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1、AdverbialClauses条件状语原因状语目的状语地点状语比较状语结果状语时间状语让步状语方式状语Adverbialclausesoftime(1)as,while,whenWhichdoyouchoose?－I′mgoingtothepostoffice.－_____youarethere,canyoubuymesomestamps?A．As B．while C．Because D．IfWhile,when在句中的不同含义:WhileIwaswalkingdownthestreet,Icameacrossanoldfriend.(while=_______)WhileIr
2、eallydon’tlikeart,Ifindhisworkimpressive.(while=_________)Helikespopmusic,whileIamfondoffolkmusic.Strikewhileironishot.Theywerewalkingdownthestreetwhentheysawanaccident.2)Ihadjustgothomewhenitbegantorain.3)Iwasabouttogoswimmingwhenourguidestoppedme.4)It'scoldwhenitsnows.AsIleftthehouse,Iforgo
3、tthekey.2.AsIgetolder,Igetmoreoptimistic.3.Helookedbehindashewent.4.Astheweatherissobad,wehavetostayhome.5.Youcandoitasyoulike.6.Oldasheis,heisstillenergetic.Judgethemeaningsof“as”.Fillintheblankswith“when,while,as”1______youmeetawordyoudon'tknow,consultthedictionary.2.Thestudentstooknotes___
4、__theylistened.3._____thewindrose,thenoiseincreased.4.Shecalled_______Iwasout.5.Wemuststrike______theironishot.6.________youhavefinishedyourwork,youmayhavearest.7.Iwasjustreadingabook______shecameintomyroom.whenasAswhilewhileWhenwhenbefore用法1.Wehadsailedfourdaysandfournightsbeforewesawland.2.
5、Wehadn’trunamilebeforehefelttired.3.Pleasewriteitdownbeforeyouforgetit.4.BeforeIcouldgetinaword,hehadmeasuredme.注意：before从句中谓语不用否定式。Beforetheyreachedthestation,thetrainhadgone.……才还没有/不到……就……趁……（还未）还没来得及……含有before的句型结构：1.Itwillbe/was＋一段时间＋before…“过多久才”It_________________________(还要过两年)heleaves
6、thecountry.It______________________(过了很长一段时间)beforehegottosleepagain.2.Itwillbe/was+not＋一段时间＋before…“不多久就……”Itwasn’ttwoyearsbeforeheleftthecountry.Itwasnotlongbeforehecameback.Since用法1.IhavereturnedhomefourtimessinceIcamehere.2.Shehasbeenworkinghere(eversince)heleftschool.常用句型：Ithasbeen(is)+时
7、间段+since从句“自从……有多长时间了”毕业已经有六年时间了。Ithasbeen(is)sixyearssinceshegraduatedfromtheuniversity.（2）引导时间状语从句的连接词除上述外还有：①till,until,Don’tgetoffthebusuntilithasstopped.Hewaitedforhisfatheruntil(till)itwastwelveo’clock.②once,assoonas,directly,immediatel
