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1状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。1.时间状语从句(1)时间状语从句常用when,as,while,before,after,since,till,until,assoonas等连词来引导。.Itwasraininghardwhengottoschoolyesterday.Whilehewasdoinghishomework,thetelephonerang.(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。.I’llringyouupassoonasIgettoNewYork.(3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。如果主句用否定式，其含义是“直到……才……”,“在……以前不……”,谓语动词可用瞬间动词。.Theyoungmanreadtillthelightwentout.Let’swaituntiltherainstops.2.条件状语从句(1)条件状语从句通常由if,unless引导。.Whatshallwedoifitsnowstomorrow?Don’tleavethebuildingunlessItellyouto.(2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。.I’llhelpyouwithyourEnglishifamfreetomorrow.Hewon’tbelateunlessheisill.(3)“祈使句+and(or)+陈述句”在意思上相当于一个带有条件状语从句的复合句。.：Hurryup,oryou’llbelate.=Ifyoudon’thurryup,you’llbelate.Studyhardandyouwillpasstheexam.=Ifyoustudyhard,youwillpasstheexam.3.原因状语从句(1)原因状语从句通常由because,since,as引导。.Hedidn’tcometoschoolbecausehewasill.Asitisraining,weshallnotgothezoo.Sinceyoucan’tanswerthequestion,I’llasksomeoneelse.2(2)because表示直接原因，语气最强。Because引导的原因状语从句多放在主句之后。回答由why提出的问题，只能用because。As和since语气较弱，一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。.------Whyaren’tgoingthere?------BecauseIdon’twantto.Ashehasnocar,hecan’tgetthereeasily.Sincewehavenomoney,wecan’tbuyit.(3)because和so不能同用在一个句子里。4.结果状语从句(1)结果状语从句由so…that,such…that,sothat引导。.Heissopoorthathecan’tbuyabikeforhisson.Sheissuchagoodteacherthateverybodylikesher.Mypencilfellunderthedesk,sothatIcouldn’tseeit.(2)so…that语such...that可以互换。.在由so...that引导的结果状语从句中，so是副词，与形容词连用。其结构是:“...so+形容词（副词）+that+从句”。Hewassogladthathecouldn’tsayaword.Thehallissobigthatitcanhold2,000people.Motherlivessofarawaythatwehardlyeverseeher.5.比较状语从句比较状语从句通常由as…as,比较级+than…等连词引导。.TomrunsfasterthanJohndoes.Thisclassroomisasbigasthatone.6.目的状语从句(1)目的状语从句通常由sothat,inorderthat引导。.Westartedearlysothatwecouldcatchthefirsttrain.Hestudieshardsothathecouldworkbetterinthefuture.Weusedthecomputerinorderthatwemightsavetime.(2)sothat既可引导目的状语从句，又可引导结果状语从句。区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can,could,may,might等。2)从意思上看，目的状语从句往往表示的目的很明确。.Speakclearlysothattheymayunderstandyou.(目的状语从句)Jackisbadlyillsothathehastorest.(结果状语从句)7.让步状语从句(1)让步状语从句通常由although,though等连词引导。Thoughheisyoung,heknowsalot.AlthoughIamtired,Imustgoonworking.3(2)although(though)不能用在同一个句子中。.我们不能说：Thoughitwasraininghard,buthestillwentout.应该说：Thoughitwasraininghard,hestillwentout.或Itwasraininghard,buthestillwentout.8.地点状语从句地点状语从句常常由where来引导。Gowhereyoulike.Wherethereisawill,thereisaway.一.选择题1._______he’sold,hecanstillcarrythisheavybag.A.ThoughB.SinceC.ForD.So2.---Doyouknowifhe_______toplaybasketballwithus?---Ithinkhewillcomeifhe______freetomorrow.A.comes;isB.comes;willbeC.willcome;isD.willcome;willbe3.Inthezooifachild_____intothewaterandcan’tswim,thedolphinsmaycomeup______him.A.willfall;tohelpB.falls;tohelpC.willfall;helpD.falls;helping4.Idon’tremember________heworkedinthatcitywhenhewasyoung.A.whatB.whichC.whereD.who5.Wewillstayathomeifmyaunt________tovisitustomorrow.A.comesB.comeC.willcomeD.iscoming6.Thepoliceaskedthechildren_______crossthestreet________thetrafficlightsturnedgreen.A.not;beforeB.don’t;whenC.notto;untilD.not;after7.Iwaslateforclassyesterday_______therewassomethingwrongwithmybike.A.whenB.thatC.untilD.because8.I’llgoswimmingwithyouifI________freetomorrow.A.willbeB.shallbeC.amD.was9.Intheexam,the________youare,______the_______mistakesyouwillmake.A.careful;littleB.morecareful;fewestC.morecareful;fewerD.morecareful;less10.Youshouldfinishyourlessons_______yougoouttopaly.A.beforeB.afterC.whenD.while11.Ihurried_____Iwouldn’tbelateforclass.A.sinceB.sothatC.asifD.unless12.Whenyoureadthebook,you’dbettermakeamark_______youhaveanyquestions.4A.whichB.thatC.whereD.though13.Theteacherraisedhisvoice_______allthestudentscouldhearhim.A.forB.sothatC.becauseD.inorder14.Hetookoffhiscoat_______hefelthot.A.becauseB.asC.ifD.since15.Itis______thatwe’dliketogooutforawalk.A.alovelydayB.toolovelyadayC.solovelyadayD.suchlovelyaday16.Maryhad______muchworktodothatshestayedatherofficeallday.A.suchB.soC.tooD.very17._______Ifeltverytired,Itriedtofinishthework.A.AlthoughB.BecauseC.AsD.Asif18.______thedaywenton,theweathergotworse.A.WithB.SinceC.WhileD.As19.______wellyoucandrive,youmustdrivecarefully.A.SolongasB.InorderthatC.NomatterhowD.Themoment20.Writetomeassoonasyou________toBeijing.A.willgetB.getC.gettingD.got