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1状语从句用法详解在主从复合句中修饰主句的动词、形容词、副词等的从句叫状语从句。一时间状语从句：起时间状语作用的从句。when,while,as,after,before,until/till,since,assoonas,immediately,themoment,everytime,whenever等。1.when,while,as1)when“当......的时候”，表示主从句的谓语动作同时发生或先后紧接着发生。IwasveryhappywhenIheardfromyou.Whenyoudealwiththem,youshouldbecautious.WhenIwasyoung,Iwenttotownmyself.（延续性动词）Whenthefirebrokeout,allthestudentsweresleepingsoundly.（非延续性动词）Asayoungman（=Whenhewasayoungman）,hewasfondofhunting.2）while引导的时间状语从句中谓语动词必须是延续性动词或表示状态的动词，侧重主句动作和从句动作相对比。MyfatherwaspreparingareportwhileIwasplayinggames.Pleasedon'ttalksoloudwhileothersareworking.3)while意为“虽然,尽管”,还能引导让步状语从句.Whileitwaslate,hewentonworking.（虽然很晚了,但他还在继续工作.）Whileheisinpoorhealth,heworkshard.（虽然他身体不好,但他还是努力工作.）4）连接两个并列句子,表示“对比”关系.例如：Hewentoutforawalk,whileIstayedathome.他出去散步了,而我却呆在家里.）Ilikesingingwhileshelikesdancing.（我喜欢唱歌,而她喜欢跳舞.）Youlikesports,whileIprefermusic.5）as表示从句和主句的两个动作交替进行或同时发生，可译为“一边......，一边......”或“随着......”。Hehurriedhome,lookingbehindashewent.Astimegoeson,it'sgettingwarmerandwarmer.注意：如果主句表示的是短暂动作，而从句用延续性动词的进行时态表示在一段时间内正在进行的动作，when,while与as可互换。When/While/AsIwaswalkingdownthestreet,Icameacrossanoldfriendofmine.2.till,until和not...until1）until/till肯定句：主句的谓语动词必须是延续性动词，主句、从句都为肯定式，意为“某动作一直延续到某时间点才停止”。Heremainedthereuntil/tillshearrived.Youmaystayhereuntil/tilltherainstops.2）否定句：主句的谓语动词必须是非延续性动词，从句为肯定式，意为“某动作直到某时间才开始”。构成not...until/till，意为“直到......才”。Shedidn'tgotobeduntilIcomeback.Don'tworry.Wewon'tsetoffuntilyouarrive.3）till不可以置于句首，而until可以。2Untilyoutoldmethenews,Ihadnoideaofit.4）not...until句型中的强调和倒装用法。强调句型：ItwasnotuntilyoutoldmethatIhadanyideaofit.倒装句型：NotuntilyoutoldmedidIhaveanyideaofit.（notuntil置于句首，主句要用部分倒装结构）Notuntiltheclockstruck12didsherealizeshemustgohomeatonce.3.before1）before“没有来得及......就”“未......就”“......就......”Someonecalledmeupinthenight,buttheyhungupbeforeIcouldanswerthephone.Theyhadtalkedonlyafewminutesbeforetheyfoundtheywerequitedifferentinopinion.2）before作“......才......”Thebusdriveralmostknockedmedownbeforehesawme.Thefirelastedaboutfourhoursbeforethefirefighterswereabletocontrolit.3）before可译为“趁”“以免”“以防”等。I'lldoitbeforeIforgotit.趁还没有忘，我现在就把这事做了。We'dbetterfinishtheworkintimebeforethebossscoldsus.4）before可译为“（宁可......而）不愿”。He'ddiebeforeheapologizestothem.他宁死也不向他们道歉。I'dgiveuptheplanbeforeIturntohimforhelp.注意：“It+be+一段时间+before从句”中的主句和从句的时态有两种情况：如果主句用一般将来时，则从句用一般现在时，意为“多长时间以后某事即将发生”；Itwon'tbelongbeforewemeetagain.不久我们就会再见的。如果主句用过去时，从句也用过去时，意为“多长时间以后某事才发生”。Itwas3yearsbeforehecamebackfromabroad.三年后他才从国外回来。4.since译为“自从......”，主句常用现在完成时，从句常用一般过去时。Hehasstudiedveryhardsincehecametoourschool.Ihaven'theardanynoisesinceIslept.HehaswrittentomefrequentlysinceIwasill.5.assoonas,immediately,directly,instantly,themoment,theminute,theinstant,nosooner...than...,hardly/scarcely...when...和once（一......就）这些从属连词引导的从句都表示从句的动作一发生，主句的动作随即发生，常译作“一......就......”。从句中用一般时态代替将来时态。ThemomentIheardthevoice,Iknewfatherwascoming.Nosoonerhadwearrivedatthestationthanthetrainleft.Theboyburstintotearsimmediatelyhesawhismother.注意：nosooner...than;hardly...when...时态搭配：nosooner与hardly引导的句子的谓语动词应用过去完成时，而than与when引导的句子的谓语动词应用一般过去时。3当把nosooner和hardly提到句首时，应用倒装语序。Ihadhardlygothomewhenitbegantorain.HardlyhadIgothomewhenitbegantorain.6.everytime,eachtime,nexttime,thefirsttime,anytime,allthetime等名词短语用来引导时间状语从句，表示“每当......；每次......；下次......”等。Every/EachtimeIwasintrouble,hewouldcometohelpmeout.Nexttimeyoucome,doremembertobringyoursonhere.ThelasttimeshesawJames,hewaslyinginbed.IthinkofthethingsandthepeoplewhenwestudiedthereeverytimeIgobymymotherschool.二地点状语从句：在句中作地点状语的从句称为地点状语从句，可置于句首、句中或句尾。引导词有where,wherever,anywhere,everywhere,nowhere等。Makemarkswhereyouhavequestions.Youcangoanywhereyoulike.Wherethereisawill,thereisaway.注意：地点状语从句与定语从句的区别where引导定语从句时，从句前应有一个表示地点的词作先行词；而状语从句前则无需用先行词。Gobackwhereyoucamefrom.Gobacktothevillagewhereyoucamefrom.You'dbettermakeamarkwhereyouhaveanyquestions.（状语从句You'dbettermakeamarkattheplacewhereyouhaveanyquestions.（定语从句）三让步状语从句引导让步状语从句的连词有although,though,as,evenif,eventhough,while,whether...or...,whether(...)ornot,whatever,nomatterwhat/how/why等。1.though/although引导的让步状语从句1）although和though意义相同，都意为“虽然，即使”，表示让步，可互换使用，区别在于although语气较重，大多置于句首。2）though/although引导让步状语从句时，主句若用yet或still引出，更加强调对比性，但不可出现but。3）though引导的从句可以把表语、状语、动词等提至句首。在asthough,eventhough中一般不可用although代替。同时although不可当副词用，而though则可。Althoughit'sraining,theyarestillworkinginthefield.Shortthoughitis,thearticleisveryimportant.注意：though还可用作副词，意为“可是，然而”，置于句末。Hesaidhewouldcome;hedidn't,though.他说他会来，可是没有来。2.eventhough/evenif引导的让步状语从句4Eventhoughheispoor,sheloveshim.(=Heispoor,yetsheloveshim.)Evenifheispoor,sheloveshim.(=Hemaybepoor,yetsheloveshim.)3.as引导的让步状语从句,从句中的表语、状语以及谓语中的实义动词需提前至从句句首，作表语的单数可数名词前如有冠词，冠词需要省去。Childas/thoughhewas,heknewwhatwastherightthingtodo.=Thoughhewasachild,heknewwhatwastherightthingtodo.Muchas/thoughIlikeit,Iwon'tbuyit,forit'stooexpensive.Tryas/thoughyoumay,youwillneversucceed.Tiredas/thoughhewas,hecontinuedtowork.4.whether..or/whether(...)ornot引导的让步状语从句You'llhavetoattendtheceremonywhetheryou'refreeorbusy.Whetheryoubelieveitornot,it'strue.5.while引导的