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状语从句在复合句中作状语，位置灵活。状语从句可分为时间状语从句，地点状语从句，原因状语从句，条件状语从句，让步状语从句,目的状语从句，结果状语从句,方式状语从句，比较状语从句。时间状语从句1.when,as,whilea.when表时间，从句既可以用延续性动词，又可以用瞬间动词。WhenIgetthereIwillcallyou.如果when引导的时状的主语与主句的主语相同，而从句的谓语又是be动词时，那么从句中的主语与be可省。如果when引导的时状的主语与主句的主语相同时，往往可以用“when+分词”的形式代替该状从。When（youare）introuble,youcanaskherforhelp.WhenIcameintotheroom(Whencomingintotheroom),Ifoundthelightwasoff.b.while表时间，从句需用延续性动词，或者主句的动作发生在从句的动作进行过程中。主句的谓语动词HecameinwhileIwasreadingabook.ImetherwhileIwasinschool.c.as表时间，与when相似，但侧重强调主从句动作同在时间点或同时间段进行。同时可表示主句的动作随着从句的动作的变化而变化。Hejumpsashesings.Asthewindrose,thenoiseincreased.2.before(在……之前)与after（在……之后）Seemebeforeyouleave.IsawthemafterIarrived.3.till与until肯定形式表示的意思是做某事直至某时。否定形式表达的意思直至某时才做某事。Waittill/untillIcallyou.等着直到我叫你。Shedidn'tarrivetill/until6o'clock..她直到6点才到但是置于句首时只可用untill.Untilyoutoldme,Ihadheardnothingofwhathappened.直到你告诉我以前，出了什么事我一点也不知道。否定形式有另外两种表达方式：(1)Notuntil…在句首，主句用倒装。Mandidnotknowwhatheatwasuntiltheearlyyearsofthe19thcentury.=Notuntiltheearlyyearsofthe19thcenturydidmanknowwhatheatwas.(2)Itisnotuntil…that…Hewillnotgotobeduntilhismothercomeshome.=Itisnotuntilhismothercomeshomethathewillgotobed.4.assoonas/themoment/theinstant/thesecond/theminute/immediately和hardly/scarcely…when,nosooner…thana.assoonas/themoment/theinstant/thesecond/theminute/immediately表示主句和从句的动作同时发生。译为“一……就”：Themomentsheheardthenews,shebegancrying.b.hardly/scarcelyhadsbdone…whensbdid…,nosoonerhadsbdone…thansbdid…表示一…就…的意思，Ihadhardly/scarcelygothomewhenitbegantorain.=Hardly/ScarcelyhadIgothomewhenitbegantorain.Ihadnosoonergothomethanitbegantorain.=NosoonerhadIgothomethanitbegantorain注意：如果hardly,scarcely或nosooner置于句首，句子必须用倒装结构。地点状语从句1.where:哪里Eg:Putthemedicinewhereyoucaneasilygetit.2.wherever：无论哪里Eg:Hefollowsherwherevershegoes.Whereveryouare,Iwillberighttherewaitingforyou.原因状语从句1.because—直接原因，非推断．语气最强．回答why。Eg：IdoitbecauseIlikeit.2.as–不谈自明的原因，语气最弱。Eg:Asheishonestandmodest,allhisfriendslikehim.3.for–放句中，对前面一句话的内容的补充说明。从句只能置于主句之后并且必须用逗号与主句隔开。Eg:Hecouldnothaveseenme,forIwasnotthere.4.since/seeing(that)/now(that)/considering(that)/inthat–通常放句首．译为“既然”。Eg:Sincethepurserdidn’ttelluswhattodo,wecanrelax.条件状语从句1.if:“如果”(如为真实条件句用陈述语气、如为非真实条件句用虚拟语气)Ifitsnowstomorrow,theflightwillbecanceled.IfIwereabird,Iwouldfly.2.incase,onconditionthat,providing,provided(that),supposing,supposed(that):“假如，在……条件下”ThemotherpromisestothesontobuyhimatoyairplaneonconditionthathepasseshisEnglishtest.Suppose(that)hedoesnotcome,whatshallwedo?3.unless:“除非”（=ifnot）Wecan’tgetthereontimeunlesswebooktheearliestflight=Wecannotgetthereontimeifwedon’tbooktheearliestflight.3.as/solongas:“只要”Eg:Wewillsucceedaslongaswekeepontrying让步状语从句1.“虽然，即使，尽管”a.although/though/eventhough/evenifalthough/though语气较弱（尽管），eventhough/evenif（即使）语气较强。Eg:Although/thoughitwasnothisfault,hetookalltheblame.Evenif/Eventhoughyoudon’tlikeyourboss,youshoulddoyourwork.b.asas可引导让步状语从句，表示“虽然、尽管”，但要用倒装结构，形式如下：1）.形容词/过去分词/名词+as+主语+系动词副词+as+主语+谓语部分Tiredasheis,heofferstohelpme.Well-writtenasthebookis,theauthorisnotsatisfiedStudentasheis,hedoesnotstudyhard.MuchasIadmirehiscourage,Idon’tthinkheactedwisely.though在引导让步状语从句时可像as一样倒装。2.while:尽管Whileit’snoneofmybusiness,Iwillwatchyou.3.nomatter(what,when,where):无论（什么，何时，何地）Theoldmanwouldn’tbelieveanythingnomatterwhatyousaid.Pleasetellmetheresultnomatterwhenyougetit.4.however:不论怎样。however引导让步状语从句时，句子通常倒装，一般在however后加形容词或副词。Eg:Thefathercouldn’tmakehisdaughtersmilehoweverhardhetried.5.whether…ornot:不管是否:Whetherheisgoodornot,thecompanydecidedtosendhimabroad.总结：1)although与though在一些情况下可互换，都可以与yet，still连用，但不能和but连用。2)however引导让步状语从句时后紧跟形容词或副词。3)while也可引导让步状语从句，这一点特容易被考生忽视。4)whatever修饰名词，“无论什么”，however修饰形容词、副词，“无论多么，无论怎么”。5)evenif/eventhough(即使)与asif/asthough(好像)目的状语从句1.(so)that/inorderthat表示“为了，以便”Heshoutedatthetopofhisvoicesothat/inorderthathemightbeheard.如果表示“为了，以便”的目的状语从句的主语与主句的主语相同，可用inorderto或soasto替代。Icameearlysoasto/inordertocatchthefirsttrain.2.lest,forfearthat,incaselest,forfearthat,incase表示“以免，以防”。其中lest,forfearthat要用(should)+动词原形的虚拟语气；incase后的从句可用虚拟语气，也可用陈述语气。Iwillnotmakeanoiselest/forfearthatI(should)disturbyou.Takeyourumbrellaincaseitrains.结果状语从句1.sothat既可以引导目的状语从句又可以引导结果状语从句。Eg:Heworriedsothathecouldn’tsleep.IgetupearlysothatIshouldcatchthetrain.2.表示“如此……以致……”的“so…that…”和“such…that…”均可以引导结果状语从句，其中的such是形容词，修饰名词;so是副词，修饰形容词或名词。具体搭配如下：1）“so+adj./adv.+that”,“so+adj.(a/an)+n.+that”2)“such(a/an)(+adj.)+n.+that”Eg:Theboyissoyoungthathecan'tgotoschool.Heissuchayoungboythathecan'tgotoschool.方式状语从句1.as,(just)as…so…Doasyouaretoldto.Aswateristofish,soairistoman。2.asif/asthoughHelooksasifhehadbeenhitbylighting.Itlooksasiftheweathermaypickupverysoon.比较状语从句1.as…as…:像……一样Mygrandmatoldmethathereyesightwasasgoodas10yearsbefore.2.notso(as)…as…:不像……ThejobisnotsodifficultasIthoughtitwouldbe.3.…than…:比……怎么样，Peoplebelievethatbeingastewardisbetterthanmostoftheotherjobs.4.Themore…,themore:越……越Themorehelistenedtothatsong,themoreheenjoyedit.实战演练：1.Don’tbeafraidofaskingforhelp_______itisneeded.A.unlessB.sinceC.althoughD.when2.Agoodstorytellermustbeabletoholdhislisteners’curiosity__