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1、状语从句TheAdverbialClause状语从句1.时间状语从句2.条件状语从句3.地点状语从句4.方式状语从句5.原因状语从句状语从句在句子中做状语，修饰主句中的动词、形容词和副词等。6.比较状语从句7.结果状语从句8.让步状语从句9.目的状语从句一、时间状语从句1.when,while,as,before,after,once；2.since,till/until,not…until；3.assoonas,themoment,immediately,theinstant,nosooner—than,hardly/scarcely–when;4.thefirsttime,everytim
2、e,eachtime引导时间状语从句的连词：①二者均可表示“当……的时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，二者可通用。ImetJimwhen／whileIwaswalkingalongthestreet．when，while的区别：②when可与终止性动词连用，while只能与延续性动词连用。Itwassnowingwhenwegottotheairport．（不能用while）③while强调主句表示的动作持续于while所指的整个时间内；when可指主、从句所述动作同时或先后发生。PleasewritewhileIamreading．Mymotherwascookin
3、gwhenthetelephonerang.Whenhereachedhome,hehadalittlerest．在肯定句中，表示“直到……为止”，主句要用延续性动词,表示动作的结束；在否定句中，表示“直到……才”，主句常用终止性动词，表示动作的开始；这时till和until可用before替换。until=tillIwaitedtill／untilhearrived．Wewon'tstartuntil／till／beforeBobcomes．1．Themeetingdidn’tstart___everyonewasthere．becauseB.untilC.whyD.if2．Theboy__
4、_tobed___hismothercamein.wentnot;untilB.didn’tgo;afterC.went;untilD.didn’tgo;until3.Iwon’tbelieveyou___Ihaveseenitwithmyowneyes.beforeB.untilC.afterD.when从句中常用过去时，主句用一般现在时或现在完成时。WhathaveyoudonesinceyoujoinedtheGreenerChina?WherehaveyoubeensinceIsawyoulastyear？since如果主句是一般将来时，情态动词加动词原形或祈使句时，时间状语从句用一般
5、现在时。I'llphoneyouassoonasIarriveinBeijing．assoonas1.IwaswaitingforthebuswhileImethim.2.Whilehewasdoinghishomework,Ilistenedtotheradio.3.I’lltellyouassoonasI’llknow.4.Weoftenfinishourhomeworkafterwegotobed.5.Wehavebeenfriendsafterwemetatschool.6.Jimdidn’tgotobedsincehismothercameback.改错：whenwaslisteni
6、ng/beforesinceuntil二、条件状语从句引导条件状语从句的连词：if,unlessIfIwillhaveenoughmoneynextyear,IwillgotoJapan.2)假如你努力，你就会成功。/Ifyouworkhard,youwillsucceed.Providing/provided(that),suppose/supposing(that),as/solongas,onconditionthatWecan’twritetoMaryunlessshetellsusheraddress.Wecan’twritetoMaryifshedoesn’ttellusherad
7、dress.我们不能给玛丽写信除非她告诉我们地址。.三、原因状语从句1.because,since,as2.Nowthat=since=when引导原因状语从句的连词：Theshipwasputoffbecausetherewasastorm.Theshipwasputoffbecauseofthestorm.Becausehewasill,hedidn’tgotoschool.Hewasill,
