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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whenaswhilebeforeaftersincetilluntilassoonas等连词来引导。例如：Itwasraininghard（rainhard下大雨）whengottoschoolyesterday.Whilehewasdoinghishomeworkthetelephonerang.Ashewalkedalong（沿着走）thelakehesanghappily.HehadlearnedalittleChinesebeforehecametoChina.Afterhefinishedmiddleschoolhewenttoworkinafactory.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。例如：I’llringyouupassoonasIgettoNewYork.Iwilltellhimeverythingwhenhecomesback.Hewon’tbelieveituntilheseesitwithhisowneyes.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。例如：Theyoungmanreadtillthelightwentout（熄灭）.Let’swaituntiltherainstops.Wewon’tstartuntilBobcomes.Don’tgetoff（从下来）untilthebusstops.【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。Until是指直到某一特定事件发生的时候，而讲话的人在自己心里认为，在那个时刻之后，该事情或该状况将中止（不怎么可能持续）。固定组合里frommorningtillnight，till/until是不能替换的，】2.条件状语从句1)条件状语从句通常由ifunless引导。例如：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。例如：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。例如：Hurryuporyou’llbelate.=Ifyoudon’thurryupyou’llbelate.Studyhardandyouwillpasstheexam.=Ifyoustudyhardyouwillpasstheexam.3.原因状语从句1)原因状语从句通常由becausesinceas引导。例如：Hedidn’tcometoschoolbecausehewasill.Asitisrainingweshallnot（不得；不应该）gotothezoo.Sinceyoucan’tanswerthequestionI’llasksomeoneelse.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。例如：-Whyaren’tgoingthere?-BecauseIdon’twantto.Ashehasnocarhecan’tgetthereeasily.Sincewehavenomoneywecan’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…thatsuch…thatsothat引导。例如：Heissopoorthathecan’tbuyabikeforhisson.Sheissuchagoodteacherthateverybodylikesher.MypencilfellunderthedesksothatIcouldn’tseeit.2)so…that语such...that可以互换。例如：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”。例如：Hewassogladthathecouldn’tsayaword.Thehallissobigthatitcanhold2000people.Motherlivessofarawaythatwehardlyever（几乎不，从来不）seeher.在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；名词前面可以带形容词，也可不带。如果是单数可数名词，前面需加不定冠词a或an。例如：Itwassuchahotdaythatnobodywantedtodoanything.Hehadsuchlongarmsthathecouldalmosttouchtheceiling.（天花板）Hemadesuchrapidprogressthathedidverywellinthemid-term.有时上述两种结构是可以互换的。例如：Itwassuchawonderfulfilmthatallofuswantedtoseeitagain.=Thefilmwassowonderfulthatallofuswantedtoseeitagain.Itissuchanimportantmatchthatnobodywantstomissit.=Thematchissoimportantthatnobodywantstomissit.3)如果名词前由manymuchlittlefew等词修饰时，只能用so不用such。例如：Soonthereweresomanydeerthattheyateupallthewildroses.Hehassolittletimethathecan’tgotothecinema（去看电影）withyou.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。例如：TomrunsfasterthanJohndoes.Thisclassroomisasbigasthatone.6.目的状语从句1)目的状语从句通常由sothatinorderthat（为了，以便）引导。例如：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cancouldmaymight等。②从意思上看，目的状语从句往往表示的目的很明确。例如：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althoughthough等连词引导。例如：Thoughheisyoungheknowsalot.AlthoughIamtiredImustgoonworking.2)although(though)不能用在同一个句子中。例如：我们不能说：Thoughitwasraininghardbuthestillwentout.应该说：Thoughitwasraininghardhestillwentout.或Itwasraininghardbuthestillwentout.8.地点状语从句地点状语从句常常由where来引导。例如：Gowhereyoulike.Wherethereisawillthereisaway.总结：状语从句分类及常用连词类别连词时间状语从句whenwheneverwhileasbeforeaftersincetillonce（一旦）地点状语从句wherewherever原因状语从句becausesinceasfornowthat（既然，由于）etc.（etcetera，等于andsoon）目的状语从句inorderthat(为了，以便)sothatthatetc.结果状语从句so…thatsothatsuch…thatthatetc.条件状语从句ifunlessas(so)longasetc.让步状语从句thoughalthoughevenifeventhoughhoweverwhateverasetc.比较状语从句as…asso…asthanetc.方式状语从句asasifasthoughetc.练习一一、单项填空1._______he’soldhecanstillcarrythisheavybag.A.ThoughB.SinceC.ForD.So2.-Doyouknowifhe_______toplaybasketballwithus?-Ithinkhewillcomeifhe______freetomorrow.A.comes;isB.comes;willbeC.willcome;isD.willcome;willbe3.Inthezooifachild_____intothewaterandcan’tswimthedolphinsmaycomeup______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.Intheexamthe________youare______the_______mistakesyouwillmake.A.careful;littleB.morecareful;fewestC.morecareful;fewerD.morecareful;less10.Youshouldfinishyourlessons_______yougoouttoplay.A.beforeB.afterC.whenD.while11.Ihurried_____Iwouldn’tbelateforclass.A.sinceB.so