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一个____在复合句中用作状语时,在语法上叫状语从句。从句由_____或________引导。分类：状语从句可表示1)________2)_________3)_________4)_________5)_________6)_________7)_________8)_________9)_________等句子时间地点原因目的结果条件行为方式比较让步名词词组连词一.引导时间状语从句1.when,while,as,before,after,until,till,since,eversince,once,assoonas，2.everytime,next/last/eachtime,thefirsttime,themoment,theminute,theinstant3.hardly…when,nosooner…than,scarcely…when其中when,till,until,before,after,assoonas,themoment等引导时，如果主句的时态是一般将来时，则从句的时态用一般现在时。when,while,as1._______________weweretalking,MrSmithscamein.2._____theycamehome,Iwascookingdinner.3.Iwasabouttogotobed_______Iheardsomeoneknockatthedoor.4.________wewerewatchingTV,hewasstudying.5.Heisfat_______hisbrotheristhin.6.______shesang,tearsrandownherface.Conclusion:A:从句为”当……的时候”,从句谓语为延续性动词,主句谓语为非延续性动词(即终止性动词),三者可通用.B当从句的谓语动词为终止性动词,只能用when;表示”正在那时”,也只能用when.C.从句和主句的谓语动词都为延续性动词时,只能用while;while还可作并列连词,表示”而”.D.当强调主句和从句的动作同时发生时,只能用as,译为”一边……一边……;随着……”While/As/WhenWhenwhenWhilewhileAsbefore,after,since1.Hehadleftthetowntheday______shearrived.2.Itwasnotlong_____helefthishometown.3.Iplayedfootball_____I(had)finishedmyhomework4.PleasetellherI’llcome_______Idosomeshopping.5.Itwillnotbelong_____wemeateachotheragain.6.I__________(be)athisbedsidesincehe_______(become)ill.7.It_________(be)twoyearssincewe_______(begin)tousethismachine.beforeafterConclusion:1.before引导的从句是过去式,主句是过去时或过去完成时;.主句为过去时,after从句可用一般过去时代替过去完成时.since从句用过去时态,主句一般用现在完成时.Itis/hasbeen+一段时间+since从句“自从…已经…”Itwas/won’tbe+一段时间+before从句“过了…才...”beforebeforeafterhavebeenbecameis/hasbeenbegantill与until:1.Helivedwithhisparents________hegraduatedfromcollege.2.Not____hetoldmedidIknowthetruth.3.Thechildren___________(willcome)homeuntil/tillit’sdark.4.Itwas_________thewarwasoverthathereturnedtohisland.till/untiluntilwon’tcomenotuntilConclusion:1.位于句首时.只能用until,不用till.2.not…until可改写为:Itis/wasnotuntil…that强调句.3.notuntil放在句首，主句谓语要部分倒装。一…就…ill.1._______________________hesawthemonster,heturnedpale.2.Thespyhad_________returnedhomethanhewastoldtogotoanothercountry.3.Wehad____________returnedhomewhenitrained.4.____________hadwebegunwhenwetoldtostop.Themoment/minute/Assoonasnosoonerhardly/scarcelyHardly/ScarcelyConclusion:1.hardly…when,nosooner…than,scarcely…when引导，从句用过去完成时，主句用一般过去时。2.否定词hardly,scarely和nosooner位于句首时，从句要部分倒装。二.地点状语从句:where,anywhere,everywhere.Youwouldletyourchildrenplaywhereyoucanseethem.because,as,since,for三.原因状语从句:Conclusion:1.because语气最强，强调原因，既可以放在句首，也可以放在句中。回答“why”的提问。2.since表示“既然”，语气较弱；强调结果，只可以放在句首。3.as语气最弱，强调结果，只可以放在句首。4.for表示通过逻辑推断得出的原因。用because,as,since与for填空:1.--Whyareyoucrying,meg?---______I’vebrokenyournecklace,mom.2.Iwenttobedearly_______Iwastired.3.Iwasnotkindtohim_______hewasrude.4.________Ihadacold,Iwasabsentfromschool.5.MymotherwasillandIsentforTom,___hewasadoctor.6._____weareallhere,let’sbeginourclass.becausebecausebecauseAsforSinceConclusion:1.条件状语从句中一般用“主将从现”.2.虚拟语气在If引导的条件状语从句的使用：四.条件状语从句:if,unless,once,as/solongas（只要）,sofaras(据我所知…),If引导的从句主句与现在事实相反were/didwould/should/could+动词原形与过去事实相反haddonewould/should/could+haddone与将来事实相反were/didshoulddoweretodowould/should/could+动词原形1.IfI_______(be)abird,Iwouldflytoyou.2.Ifyou________(leave)homealittleearlierthismorning,you_______________(catch)thebus.3._____badweatherstopsme,Ijogeveryday.4._______IarriveatBeijing,I’llcallyou.5.I’llgo___________________yougo.6._______anythingimportanthappens,pleasecallmeup.werehadleftwouldhavecaughtUnlessOnceas/solongasIf五、让步状语从句1.Hewentout,________itwasraining.2._________theyarepoor,theybuyagreatmanybooks.3.Child____heis,hehaslearntadvancedmathematics.4._______heisachild,hehaslearntadvancedmathematics.5.Nomatter________happens,don’tbediscouraged.6.Nomatter______yougo,youmustwritetoyourparents.7.Nomatter______hardhetried,hecouldn’topenthedoor.8.Nomatter______youmarryinthefuture,hemustbeanhonestman.though/althoughAlthoughaswhatwherehowwhothough,although,evenif/though,nomatter…,whatever,however…,whether…or…,asEvenifConclusion:1.Although多用于句首.2.as引导让步状语从句,表示“尽管、虽然”。但从句要倒装。句型为：adj./adv./单数n.(不加冠词)+as+主语+谓语…Youngassheis,shecanhelphermother.Fastasheruns,heisthelastone.六、目的与结果状语从句1.Hegotupearly_____________________hecouldcatchthebus.2.____________hecouldcatchthebus,hegotupearly.3.Iwascaughtinashower,________allmyclothesgotwet.4.It’s____cold_____thelakehasfrozen.5.Thereare______manybooksthere_____Idon’tknowwhichonetoborrow.6.It’s_____goodabook_______I’vereaditagainandagain.7.Itwas_____acoldday_____therewasnobodyonthestreet.8.______coldweatherremainedforthreedays_____Ihadtostayathomealldaylong.inorderthat/sothatInorderthatsothatsothatsothatsothatthatsuchSuchthatsothat,inorderthatso（that）,so…that…,such…that….1.由sothat;inorderthat引导的目的状语从句中通常用may,could,can等情态动词.2.Inorderthat从句可放于句首,而sothat引导的从句只能放在主句之后.3.so…that引导结果状语从句时,so常用于修饰形容词或副词,或用于修饰many,much,little,few.语序为:so+adj./adv.so+adj.+a/an+n.4.such可修饰任何名词,当其修饰单数可数名词时,语序为:such+a/an+(adj.)+n.Conclusion:七、比较状语从句:1.Hisbrotheris____handsome____he(is).2.Themoviewasnot______good____Ihadexpected.3.Yourbagistwiceasexpensiveas_______(me).4.Thedriverdrivesfaster_____heusedto(drive)