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1、时间状语从句PPT课件.掌握状语从句的关键1.准确掌握每一个连词的含义。2.注意主句和从句的时态呼应。Adverbialclausesoftime(1)as,while,whenWhichdoyouchoose?－I′mgoingtothepostoffice.－_____youarethere,canyoubuymesomestamps?A．As B．while C．Because D．If连接词类别作用例句asas表示“当……的时候”，往往和when/while通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。1.Shec
2、ameupasIwascooking.（同时）2.Therunnersstartedasthegunwentoff.（几乎同时）whenwhen可以和延续性动词连用，也可以和短暂性动词连用；when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生。1.Whenwewereatschool,wewenttothelibraryeveryday.（在一段时间内）2.Sorry，Iwasoutwhenyoucalledme．（call为短暂性动词）对不起，你打电话时我刚好外出了。
3、3.WhenIgottotheairport，theguestshadleft．（gotto后发生）当我赶到飞机场时，客人们已经离开了。while从句动作和主句动作同时发生，且从句动作为延续性动词时，(when，while，as都可使用)。主句中的动作或事情是在从句中的动作或事情的进展过程中发生，从句中的动词一般要用延续性动词。1.When／While／Asweweredancing，astrangercamein．（dance为延续性动词）。2.Pleasedon’ttalksoloudwhileothersareworking.Wh
4、ile,when在句中的不同含义:WhileIwaswalkingdownthestreet,Icameacrossanoldfriend.(while=_______)WhileIreallydon’tlikeart,Ifindhisworkimpressive.(while=_________)Helikespopmusic,whileIamfondoffolkmusic.Strikewhileironishot.Theywerewalkingdownthestreetwhentheysawanaccident.2)Ihadjust
5、gothomewhenitbegantorain.3)Iwasabouttogoswimmingwhenourguidestoppedme.4)It'scoldwhenitsnows.AsIleftthehouse,Iforgotthekey.2.AsIgetolder,Igetmoreoptimistic.3.Helookedbehindashewent.4.Astheweatherissobad,wehavetostayhome.5.Youcandoitasyoulike.6.Oldasheis,heisstillenergetic
6、.Judgethemeaningsof“as”.Fillintheblankswith“when,while,as”1______youmeetawordyoudon'tknow,consultthedictionary.2.Thestudentstooknotes_____theylistened.3._____thewindrose,thenoiseincreased.4.Shecalled_______Iwasout.5.Wemuststrike______theironishot.6.________youhavefinishe
7、dyourwork,youmayhavearest.7.Iwasjustreadingabook______shecameintomyroom.whenasAswhilewhileWhenwhenbefore用法1.Wehadsailedfourdaysandfournightsbeforewesawland.2.Wehadn’trunamilebeforehefelttired.3.Pleasewriteitdownbeforeyouforgetit.4.BeforeIcouldgetinaword,hehadmeasuredme.注
8、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
