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状语从句AdverbialClauses★在复合句中，修饰主句的动词、形容词或副词等的从句叫做状语从句。★状语从句根据它表达的意思可分为时间、条件、结果、比较、地点、原因、目的、让步状语从句等类型。1.时间状语从句时间状语从句通常由从属连词when,while,assoonas,before,after,until,not…until,since等引导。①当主句是一般将来时态或祈使句，表示将来的意义时，从句用一般现在时。eg:I’llcallyouassoonasIgettoLondon.Ringmeupwhenhefinishesdoinghishomework.他完成作业时给我打个电话。②when,while,as当…的时候Imethimas\when\whileIwaswalkingalongthestreet.Itwassnowingwhenwegottotheairport.(while只能与延续性动词连用)Hesangashewentalong．他边走边唱。(as强调主句与从句表示的动作同时发生)③until和till在肯定句中表示“直到……为止”，主句要用延续性动词；在否定句中，表示“直到……才”，主句常用终止性动词，这时till和until可用before替换。如：I’llwaitforyouuntil/tillyoucome.Hedidn’tgohomeuntilhefinishedhiswork.他直到做完工作才回家。Wewon’tleaveuntil\till\beforeBobcomes．鲍勃到来之前，我们不会离开④since引导的时间状语从句，表示“自……以来”，主句用现在完成时或一般现在时，从句用一般过去时。IhaveworkedinthiscompanysinceIgraduatedfromBeijingUniversity.我从北京大学毕业后，一直在这家公司上班。Itistenyearssinceheleft.他离开十年了。★1.引导条件状语从句的连词有if（如果、假如）、unless（=if…not除非）•Youwillfailunlessyoustudyhard.•=Youwillfailifyoudon'tstudyhard．除非你努力学习，否则你会失败。•Ifitisfinetomorrow,we’llgoswimmingtogether.如果明天天气好,我们将一起去游泳.•Ifyoueatbadfood,youmaybeill.如果你吃变质的食物,你可能会生病.2.条件状语从句•☆注意:当主句和条件状语从句中的动词都表将来的动作时,主句常用一般将来时,从句中常用一般现在时(主将从现).•Youwon’tbeabletopasstheexamifyoudon’tworkhard.如果你不努力学习你将不能通过考试.•Ifitrainstomorrow,I’llstayathome.如果明天下雨,我呆在家里.•★2.if表示“是否”,引导宾语从句.•Idon’tknowifhewillcometohelpustomorrow.Ifhecomes，I’llcallyou.我不知道他明天是否来帮助我们.如果他来,我给你打电话.•HeaskedmeifIwouldbefreethisSunday.他问我这个星期天是否有空.3.结果状语从句引导结果状语从句的连词有so…that（如此…以致于），such…that（如此…以致于）等。常用句型：①so＋形容词／副词＋that从句HespokesofastthatIcouldn’tfollowhim．②such+(a／an)＋adj.＋可数名词／不可数名词＋that从句Hetoldussuchfunnystoriesthatwealllaughed．4.比较状语从句比较状语从句常由than,as…as,notas/so…as等连词引导。①DalianisasbeautifulasShenzhen．Heisn’tas\sotallasI.②Herunsfasterthanyou（do）．Todayislesscoldthanyesterday．5.原因状语从句引导原因状语从句的有because,as,since(因为)等①Whycan’tIgo？Becauseyou’retooyoung．②As\Sinceyouarenotfeelingwell,you'dbetterstayathome.既然你不太舒服,还是留在家里吧6.目的状语从句引导目的状语从句的有sothat（以便），that,inorderthat等词引导。目的状语动作中常用情态动词may/might,can/could,should/will/would等HewenttoLondoninorderthat/sothathecouldseehisparents.IgetupearlysothatIcancatchuptheearlybus.Youmadesuchamistakethatnobodycouldforgiveyou.你犯了这么个错误以致于没有人可以原谅你。7.地点状语从句地点状语从句常由where,wherever等引导Wherethereisawill，thereisaway．有志者，事竞成。Shefollowshimwhereverhegoes.他无论到哪里她总跟着。8.让步状语从句让步状语从句由although,though,eventhough等引导，但不能与but用在同一个句子中。as引导让步状语从句时，应把作表语的名词或形容词放在句首。若作表语的是单数可数名词时，其前不加冠词。Thoughit’shardwork，Ienjoyit．Nomatterhowhardtheworkwas,henevergaveitup.不管工作多么艰难，他都不放弃Childassheis,shecanlookafterherself.尽管她还是个孩子,她已能照顾自己了。1.Idon'tknow___tomorrow,canyoutellme?(2006·北京)A.whenwestartedB.whendidwestartC.whenwewillstartD.whenwillwestart2.—Whatdidyourmothersayonthephone?—Sheasked_________.(2006·长沙)A.whydidIfailedthetestB.whyIfailedthetestC.whydidyoufailthetestCB3.Iwanttoknow____dotohelpmyneighbour.(2006·天津)A.whatIcanB.whatcanIC.howIcanD.howcanI4.Iwon’tbelievethatlittleBobcanrun100metersin15seconds__Iseeitwithmyowneyes.(2004.宿迁)A.untilB.afterC.whenD.ifAA5.SomepassengerswerewalkingthroughoneofthebighallsatParis’CharlesDeGaulleAirport__thewholeroof(屋顶)felldown.(2004.上海)A.whileB.assoonasC.whenD.after6.Weshouldtryourbesttoprotectourenvironment__itistoolate.(2004.河南)A.afterB.untilC.whenD.before7.Shirleyhaspassedtheexam__sheisbusywithhermuchhousework.(2004.河源)A.becauseB.whenC.sinceD.thoughDDC8.Ineverseemtoloseanyweight,__hardItry.(2004.杭州)A.eventhoughB.nomatterhowC.asifD.everysince9.—It’salongstory,butyoucanhardlyfindnewwordsinit.—Good!__itwillbetoohardforchildren.A.SoB.AndC.ButD.OrBD10.Don’tleaveuntilhe__back.A.havecomeB.comesC.willcomeD.came11.It__tenyearssincethey_____toFrance.(2001.河北)A.was…movedB.was…havemovedC.is…havemovedD.is…movedBD12.Studyhard,__you’resuretohaveagoodresultintheexam!(2001.河北)A.butB.andC.forD.or13.Hismothernevergoestobed__heisbackfromwork.(2005.模)A.untilB.asC.sinceD.whyBA