状语从句详细讲解与练习.ppt

Welcometoourclass,语法框架图,按使用目的分,1.陈述句,2.疑问句,3.祈使句,4.感叹句,:说明一个事实或陈述一种看法,:提出问题,:提出请求,建议或发出命令，省略主语you的句子,:表示说话人惊奇、喜悦、愤怒等情绪,语法框架图,、按其结构可以分:,1.简单句,2.并列句,3.复合句,1.主语+谓语,2.主语+谓语+宾语,3.主语+系动词+表语,4.主语+谓语+宾语+宾语补足语,5.主语+谓语+间接宾语+直接宾语,1,定语从句,2.名词性从句,3.状语从句,1.表语从句,2.主语从句,3.宾语从句,4.同位语从句,条件,结果,方式,让步,时间,比较.,在复合句中起名词作用的从句叫做名词性从句。,名词性从句,主语从句,表语从句,宾语从句,同位语从句,状语从句,1.时间状语从句,2.地点状语从句,3.原因状语从句,4.条件状语从句,5.让步状语从句,6.目的状语从句,7.结果状语从句,8.方式状语从句,9.比较状语从句,1.状语定义:合句中由从句担任状语，称作状语从句，它可以用来修饰谓语、定语或状语，或是整个句子2.当充当状语的部分是一个句子时，也就是状语从句。分类如下：,什么是状语？,时间,地点,条件,让步,原因,目的,结果,比较,方式,状语从句,一.时间状语从句,1.注意时态一致.一般情况下:主句是将来时的时候,从句用一般现在时1.表示同时性，即主从句的谓语动作同时发生或几乎同时发生。,1.时间状语从句,引导词可分为两部分,aswhilewhenwheneverbeforeafteruntil(till)sinceassoonas,everytimenexttimethefirst/timethemomenttheminute/instantlyimmediatelydirectly(一就),as引导的时间状语从句,可以表达“正当”，“一边一边”，“随着”等意思。,1.表示某事一发生，另一事立即发生。Asthesunrose,thefogdisappeared.,2.表示在某事发生的过程中，另一事发生。Justashewasspeakingtherewasaloudexplosion.,3.表示两个动作同时发生。Helensangasongasshewashed.,4.表示“随着.”.常指一个行为是另一个行为的结果。Asshegrewolder,shebecamemorebeautiful.,1.as,while,when的区别,while:持续性动词进行时,1.一般或现在情况2.将来情况V一般现在时或现在进行时3.过去情况,e.g.IlikelisteningtomusicwhileIamdoingmyhomework.,e.g.Imgoingtothepostoffice.-Whileyouarethere,canyougetsomestampsforme?,e.g.IhurtmyshouldwhileIwasdoinggym.,When:1.当的时候WhenIwasyoung,Iwenttotownmyself.Whenhereceivestheletter,helltellus.,before引导的时间状语从句,1.常译为“在之前”，2.表示主句的动作发生在从句的动作之前。,1.Wecleantheclassroombeforeweleaveschooleveryday.,2.Itwillnotbelongbeforeyouregretforwhatyouvedone.,after引导的时间状语从句,1.常译为“在之后”，2.表示主句的动作发生在从句的动作之后。,1.Afteryouuseplasticbags,youmustntthrowthemabout.用过了塑料袋之后，不准到处乱扔。,TheAmricanWarlastedfouryears_theNorthwonintheend.A.AfterB.beforeC.whenD.then,B,since引导的时间状语从句,1.常译为“自从”，2.主句常用现在完成时，从句常用一般过去时。,1.我们自从分手以后一直没见过面。,Wehaventseeneachothersinceweparted.,常用句型：Ithasbeen(is)+时间段+since从句“自从有多长时间了”,2.自从她大学毕业已经有六年时间了。,Ithasbeen(is)sixyearssinceshegraduatedfromtheuniversity.,before,after,since,Hehadleftthetowntheday_shearrived.Itwasnotlong_helefthishometown.Iplayedfootball_I(had)finishedmyhomeworkPleasetellherIllcome_Idosomeshopping.Itwillnotbelong_wemeateachotheragain.It_(be)twoyearssincewe_(begin)tousethismachine.,before,after,before,before,after,is/hasbeen,began,until/till引导的时间状语从句,1.常译为“直到时”，2.表示主句动作发生在从句之前。,当主句谓语动词是延续性动词时，主句常用肯定形式。,1：我会待在这里，直到你回来。,Illstayhereuntilyoucomeback.,当主句谓语动词是非延续性动词时,主句常用否定形式。notuntil“直到才”，这时until可用before替换。,Hedidntgotobeduntilhefinishedhishomework.,2.他直到做完作业才睡觉。,_heheardthis,hegotveryangry.2.ImetLucy_Iwaswalkingalongtheriver.3._achild,helivedinthecountryside.A.whenB.whileC.as,对比训练1,A,B,C,1.Wewereabouttoleave_itbegantorain.2.ShethoughtIwastalkingaboutherson,_,infact,Iwastalkingaboutmyson.3.HardlyhadIfinishedmycomposition_thebellrang.A.whenB.whileC.asD.during,对比训练2,A,B,A,assoonas引导的时间状语从句,1.译为“一就”，2.表示从句动作一发生，主句的动作马上就发生。,1.他一回来我就告诉他这件事。,Iwilltellhimaboutitassoonashecomesback.,2.相当于assoonas用法的词或短语还有：immediately,directly,instantly,themoment,theminute,theinstant等.,2.Illgivehimyourmessagetheminutehearrives.,1.DirectlyIhaddoneit,IknewIhadmadeamistake.,名词短语引导的时间状语从句,1.themoment,theminute,3.theinstant,thetime,5.thehour,theday,7.bythetime,eachtime,9.everytime,nexttime,anytime等也可以引导时间状语从句。,1.IthoughtherniceandhonestthefirsttimeIsawher.,2.Bythetimeyouarrived,thelecturehadalreadyended.,3.Bythetimehecomes,wewillalreadyhaveleft.,1.WheneverytimeIwasintrouble,hewouldcometohelpme.2.Atnexttimeyoucome,dorememberbringyoursonhere.3.ForthefirsttimeImetthegirl.Ifeltinlovewithher.4.Youarewelcometocomebackatanytimeyouwantto.5.AtthelasttimeshesawJames,hewaslyinginbed.语法规则：,everytime,eachtime,nexttime,thefirsttime,anytime等名词短语引导状语从句不加介词。,考点:名词短语引导时间状语从句,其他连词引导的时间状语从句,1.nosoonerthan,hardly/scarcely/barelywhen2.从句用一般过去时，主句用过去完成时。3.当nosooner,hardly/scarcely/barely位于句首时，主句要用部分倒装。,1.Ihadnosoonerbeguntotalkthanherangoff.2.NosoonerhadIbeguntotalkthanherangoff.我还未来得及讲话，他就挂断了电话。,1.Itcostme20yuantogettotheQuanzhouMuseumyesterday.Well,itwasawasteofmoneytotakeataxi_youcouldhavegonebybusaswell.(11泉州市质检）A.whenB.whileC.unlessD.because,2.Youneverreallyknowwhetheryoucouldhandlefailure_youcomefacetofacewithit.(11厦门市质检）A.untilB.afterC.whenD.while,3Becauseoftheheavytraffic，itwasalreadytimeforlunchbreakshegottoheroffice（10四川）AsinceBthatCwhenDuntil,4.Johnthinksitwontbelongheisready。forhisnewjob.（10陕西）A.whenB.afterC.beforeD.since,A,5.Howcanyouexpecttolearnanythingyouneverlisten？(06山东31)A.incaseB.evenifC.unlessD.when,1.IwassofamiliarwithhimthatIrecognizedhisvoice_Ipickedupthephone.A.whileB.afterC.incaseD.theminute2.Howlongdoyouthinkitwilltake_ourproductbecomespopularwiththeconsumersA.whenB.untilC.beforeD.since3._thedaywenton,theweathergotworse.A.WithB.sinceC.AsD.While4.Hewashalfwaythroughhismeal_afamiliarvoicecametohisears.A.whyB.whereC.whenD.while,6.Shehadjustfinishedherhomework_hermotheraskedhertopracticeplayingthepianoyesterday(09福建33).A.whenB.whileC.afterD.since,7.Youcantborrowbooksfromtheschoollibrary_yougetyourstudentcard.(09上海32)A.beforeB.ifC.whileD.as,需要注意的几点:1.在时间(或条件)状语从句中,要注意时态一致.一般情况下,“主将从现”Whenhereceivestheletter,helltellus.1.When_again?Whenhe_,Illletyouknow.(NMET88)A.hecomes;comesB.willhecomes;willcomeC.hecomes;willcomeD.willhecome;comes,牛刀小试(时间状语从句),_hewasonholidayhecaughtabadcold.SinceB.WhileC.AsD.During2._thedaywenton,theweathergotworse.WhenB.SinceC.WhileD.As3.Shewillwritetoyouassoonasshe_toParis.A.WillgetB.getsC.getD.got,Marymadecoffee_herguestswerefinishingtheirmeal.SothatB.althoughC.whileD.asif2.Tomwasabouttoclosethewindow_hisattentionwascaughtbyabird.WhenB.ifC.andD.till3.Johnthinksitwontbelong_heisreadyforhisnewjob.A.WhenB.beforeC.afterD.since,C,A,B,5.Someonecalledmeupinthemiddleofthenight,buttheyhungup_Icouldanswerthephone.A.AsB.sinceC.untilD.before6.Itwasalongtime_wemetagain.A.BeforeB.sinceC.forD.when7.Agoodstorytellermustbeabletoholdhislistenerscuriosity_hereachestheendofthestory.A.whenB.unlessC.untilD.after,8.Dontstop_youmeetwithawordyoudontunderstand.A.atthetimeB.eachtimeC.whileD.During9.-didyouremembertogiveAlicethemoneyyouoweher?-Yes,_Isawher,Irememberit.A.whileB.theinstantC.suddenlyD.soon10._ababyturtleishatched,itmustbeabletofeedforitself.NosoonerthanB.NosoonerC.SosoonthatD.Assoonas,地点状语从句,1.用连接副词where或wherever引导。,.a.Juststaywhereyouare.b.Wherethereisawill,thereisaway.c.Youcansitwhereveryoulike.d.Whereveryougo,Illberightherewaitingforyou.,Whenhereadsabook,hishabitistomakeamark_themeaningisuncleartohim.A.thereB.whereverC.theplaceD.inwhich,2.地点状语从句,1.Where-的地方2.Wherever=nomatterwhere-不论何处,Gowhereyouwant.Youdbettermakeamarkwhereyouhaveanyquestions.Youdbettermakeamarkattheplacewhereyouhaveanyquestions.Whereverthereissmoke,thereisfire.,地点状语从句,定语从句,Hemadeamarkattheplace_Helenwasliving.A.atwhichB.atwhereC.theplacewhereD.where,Hemadeamark_Helenwasliving.A.atwhichB.atwhereC.theplacewhereD.where,1._thereisawill,thereisaway.WhenB.ThatC.WhileD.Where2.Hemadeamark_AliBabawasliving.atwhichB.atwhereC.theplacewhereD.where3.-WhereshallIputthedictionary?-Putit_itwas.ThatB.whenC.whereD.which4.Noonewantstolive_theairispolluted.InplaceB.whereC.inwhichD.therewhere,牛刀小试(地点状语从句),1.Today,wewillbegin_westoppedyesterdaysothatnopointwillbeleftout.WhenB.whereC.howD.what2.Thelittlegirlwhogotlostdecidedtoremain_shewasandwaitforhermother.A.WhereB.whatC.howD.who,B,A,原因状语从句,1.表示主句中的某一动作或状态所发生的原因。引导这种从句2.常用的连接词是：because,as,since,nowthat,for,和consideringthat,seeingthat这七个连词都用于表示表示原因,但在语气上一个比一个弱。,e.g.Hedidntcometoschoolbecausehewasill.,c.f.Hemightbeill,forhedidntcometoschool.,表示“直接”原因。,表示“间接的推断”原因.不可出现在句首。,3.原因状语从句,because,since,as,for的区别:,1.because直接原因，非推断语气最强回答why的问题。2.since通常放句首译为“既然”3.as不谈自明的原因，语气最弱。4.for放句中，引导后半句表原因,或补充推断的理由。,1.because:因为,2.As:“由于”,表示较为明显的原因,语气弱Asyourequestit,Iwillcome.3.Since:”既然”表示对方已经知道的事实或理由Sinceeverybodyishere,letsbegin.4.nowthat：因为,既然已,现在已经NowthatIveseenhowhelives,Iknowwhyheneedssomuchmoney.,1.Idancedinfrontofthepeople_Ilikedit.2.Youdbetterwearstrongshoes_welldoalotofwalking.3._hewasnotwell,Idecidedtogowithouthim.4._everybodyknowaboutit,Idontwanttotalkanymore.5.Hemustbeill,_heisabsentToday.6.Somepeoplebelievethat_oilisrunningout,thefateofthemotorindustryisuncertain.,because,as,As,Since,for,since,牛刀小试(原因状语从句),Parentsshouldtakeseriouslytheirchildrensrequestsforsunglasses_eyeprotectionisnecessaryinsunnyweather.becauseB.thoughC.unlessD.if2._wehavefinishedthebookweshallstartdoingsomeexercises.FornowB.sincethatC.NowthatD.Sincenow3.-Whydidntheattendthemeeting?-_hethoughtitwasunimportant.SinceB.AsC.BecauseD.For4.UnlikewatchingTV,readingisahighlyactiveprocess_itrequiresattentionaswellasmemoryandimagination.A.forB.untilC.butD.unless,结果状语从句,结果状语从句常位于主句之后，由so,sothat,suchthat;sothat等引导。,a.SoquicklydidherunthatIcouldntcatchupwithhim.b.Thebusbrokedownsothatwehadtowalkhome.c.Sheissuchagoodteacherthateveryoneadmiresher.d.Hegottothestationfinally,onlytofindthetrainhadleft.,7.结果状语从句,sothat,suchthat,1.so+形容词/副词+that从句2.so+形容词+a/an+可数名词单数that从句3.such+a/an形容词+可数名词单数+that从句4.such+形容词+可数名词复数/不可数名词+that5.so+many/much/few/little+名词+thatSuch+alotof/lotsof+名词+that从句,1.Hewassoexcitedthathecouldntgotosleeplastnight.2.Itissuchaninterestingnovelthatallofuswanttoreadit.3.Itissointerestinganovelthatallofuswanttoreadit.,当So或such置于句首时，主句要用倒装语序,Sointerestingisitthatallofuswanttoreadit.,3.Mikeis_boythatwealllikehim.SogoodaB.agoodsoC.AsuchgoodD.suchgooda4.Hehas_littleeducationthathecantteach_littlechildren.so;suchB.too;suchC.a;soD.very;so,1.Popmusicissuchanimportantpartofsociety_ithaseveninfluencedourlanguage.A.AsB.thatC.whichD.where,B,目的状语从句,引导目的状语从句的连词:,inorderthat,用于正式文体中，所引从句可于主句前或后。,sothat,a.较常用，一般用于主句后,有时可分开，so有时可省;从句中要有情态动词,否则,就成为下一种句型：,b.无情态动词则引导结果状语从句。,forfearthat;incase;lest(以免)等。,6.目的状语从句,e.g.a.Wellsitnearerthefrontsothatwecanhearbetter.b.IshallwriteitdownlestIshouldforget.,注意：当从句与主句的主语一致时，可用soastodo或inordertodo,e.g.Heranfastsothathemightarrivetherebeforetenoclock.,Heranfastsoastoarrivetherebeforetenoclock.,sothat:以便,目的是inorderthat:以便forfearthatLest以防,惟恐incase,inorderthat句首句中sothat句中,目的状语从句中谓语动词要用should+do,1.Takeyourumbrellaincaseitshouldrain.2.Theyworkedharderthanusualinorderthattheycouldfinishtheworkaheadoftime.3.IshallwritedownyourtelephonenumbersothatImaynotforgetit.,Leaveyourkeywithaneighbor_youlockyourselfoutoneday.EversinceB.evenifC.soonafterD.incaseHestartedearly_hecouldgettherebeforenine.A.InorderthatB.becauseC.soastoD.inorderto,D,A,条件状语从句,1.表示主句中的某一动作或状态是在什么情况或条件下发生的。条件状语从句中通常用一般现在时表示将来。,条件状语从句由从属连词引导：if,unless(除非),as/solongas(只要),oncondition(只要),once(一旦),incase(假使),providing/provided(that)等。,e.g.a.WellcomeovertoseeyouonSaturdayifwehavetime.b.Weshouldservethepeopleas/solongaswelive.,4.条件状语从句,连词连词:并列连词和从属连词两大类。1.并列连词:连接主语与主语，谓语与谓语，句子与句子，分词与分词的词，它要求前后两部分有相同的形式和语法作用；2.从属连词:一般连接主句与从句，从句形式有名词性从句，定语从句和状语从句等。,引导条件状语从句的从属连词有：if,unless(=ifnot除非),so/aslongas（只要）,incase（万一）,onconditionthat（条件是）,suppose/supposing（假设，如果）,providedthat（如果）,_youtouchanEnglishperson,youshouldsay“sorry”._theyaredirty,certainseasarenotabletocleanthemselves._wedontloseheart,wellfindawaytoovercomethedifficulty.Youcanbeallowedtoplaythegame_youfinishyourhomeworkfirst.Donttouchanything_yourteachertellsyouto.,If,Once,Aslongas,onconditionthat,unless,1.Wewillbeabletogetthereontime,_ourcardoesntbreakdownontheroad.assoonasB.asfarasC.aslongasD.aswellas2.Intimeofseriousaccidents,_weknowsomebasicthingsaboutfirstaid,wecansavelives.whetherB.untilC.ifD.unless3._youhavetriedit,youcantimaginehowpleasantitis.A.UnlessB.BecauseC.AlthoughD.When,1.Youllfailtheexamunlessyoustudyhard.2.Aslongasyoudontloseheart,youwillsucceed.3.Suppose/supposing(that)theyrefuseus,whoelsecanweturntoforhelp?4.Incasethereisafire,whatwillwedofirst?,Thelittleboywontgotosleep_hismothertellshimastory.OrB.unlessC.butD.whether2.Theschoolrulesstatethatnochildshallbeallowedoutoftheschoolduringtheday,_accompaniedbyanadult.OnceB.whenC.ifD.unless3.-Ourholidaycostalotofmoney.-Didit?Well,thatdoesntmatter_youenjoyedyourselves.A.AslongasB.unlessC.assoonasD.though,B,D,A,方式状语从句,主句动作进行方式的状语被称为方式状语。通常用下列词语引导:as,justas,asif,asthough,theway(that),intheway(that)等。,a.WemustdoasthePartytellsus.b.Leavethethingsastheyare.c.Mostplantsneedsunlightjustastheyneedwater.d.Itsoundsasifitisraining.e.TheydiditinawaythatIhadneverseenbefore.他们以我从没见过的方式行事。f.Aswateristofish,soairistoman.我们离不开空气，犹如鱼儿离不开水,8.方式状语从句,引导方式状语从句的连词有as,justas,正如,asif,asthough好像,Doasyouaretoldto,oryouwillbefired.Theoldladytreatstheboyasifhewereherownson.IfeelasifIhaveafever.,Shepretended_nothinghadhappened.A.AsB.ifC.asthoughD.since,C,让步状语从句,让步概念的状语从句被称为让步状语从句。常用引导词：though,although,evenif,eventhough,nomatter+疑问词(what/who/where/when/which/how)疑问词-ever(whatever,whoever,wherever,whenever,however,whichever),特殊引导词：as(用在让步状语从句中必须要倒装)，while(一般用在句首)，whetheror,whether()ornot,5.让步状语从句,一、although/though,evenif,eventhough引导让步状语从句,不能和but连用,Heisunhappy,though/althoughhehasalotofmoney.Although/thoughitwasraininghard,yettheywentonplayingfootball.Evenif/thoughitisraining,wewillgothere.,注意Though还可用作副词，意思为可是，然而，置于句末Hesaidhewouldcome;hedidnt,though.,二、as或though引导让步状语从句时倒装的情况,as或though从句一般放在主句之前，常用倒装语序。从句中的表语、状语或动词原形置于句首，若表语是单数名词，前置时要省略冠词,Childas/thoughheis,heknowsalot.Muchas/thoughIlike,Iwontbuyit,foritstooexpensive.Tryas/thoughhemight,hecouldnotfindajob.,Although引导让步状语从句只能用正常语序,as引导让步状语从句,，必须将从句中的、以及谓语中的提前至从句句首，作表语的单数可数名词前如有冠词，冠词需。,表语,状语,实意动词,省略,Thoughheworkshard,hemakeslittleprogress.,Hardas/thoughheworks,hemakeslittleprogress.,Thoughhewasachild,heknewwhatwastherightthingtodo.,Childas/thoughhewas,heknewwhatwastherightthingtodo.,Thoughyoumayobject,Illgo.,Objectasyoumay,Illgo.,whetheror,whether()ornot,whetheror,whetherornot表示“不论是否”，“不管是还是”。其引导的从句旨在说明正反两方面的可能性都不会影响主句的意向或结果。,Whetheryoubelieveitornot,itistrue.,Youllhavetoattendthepartywhetheryouarefreeorbusy.,while也可以引导让步状语从句，意为“尽管”，语气比though/although弱。其引导的从句一般位于。,句首,例句：我尽管喜欢它的颜色，但不喜欢它的形状。,WhileIlikeitscolor,Idontlikeitsshape.,三、whetheror不管.还是；疑问词+ever与nomatter+疑问词(不管;无论),Whetheryoubelieveitornot,itistrue.Whatever(nomatterwhat)yousay,hewontbelieveyou.Whoever(nomatterwho)youare,youmustobeytherules.,Whoever,whatever,whichever还可以引导名词性从句Youcantakewhateveryoulike.,though,although,判断以下句子是否正确：Althoughheisrich,butheisnothappy.Althoughheisrich,yetheisnothappy.Althoughwehavegrownup,ourparentsstilltreatusaschildren.,要点归纳：though,although当“虽然”讲,都不能和but连用.但是他们都可以同yet(still)连用.,everif,eventhough,evenif和eventhough表示“”,即使,Wellmakeatripeventhoughtheweatherisbad.,nomatter+疑问词疑问词-ever,Nomatterwhathappened,hewouldnotmind.Whateverhappened,hewouldnotmind.,替换：nomatterwhat=whatevernomatterwho=whoevernomatterwhen=whenevernomatterwhere=wherevernomatterwhich=whichevernomatterhow=however,判断正误：Nomatterwhatyousayisofnousenow.Whateveryousayisofnousenow.,归纳：nomatter+疑问词不能引导主语从句和宾语从句，而“疑问词+ever”则可以,四、when和while也可以引导让步状语从句，相当于although,Suddenlyshestoppedwhensheoughttohavecontinued.,_Iacceptthatheisnotperfect,Idoactuallyliketheperson.A.WhileB.sinceC.BeforeD.Unless2.Theworkersaredeterminedtogothroughwiththeirrailwayproject,_theexpenseshaverisen.A.aslongasB.eventhoughC.nowthatD.asthough3.Ireallywantthematch,howevermuch_.A.doesitcostB.costsitC.willitcostD.itcosts,4._wehavefinishedthecourse,weshallstartdoingmorerevisionwork.A.FornowB.NowthatC.BynowD.until5._,theideaofhavingtoworkunderawomandefeatedhim.A.WantingthejobverymuchB.AlthoughwantingthejobbadlyC.ThoughhewantedthejobverymuchD.Hewantedthejobbadly,_Hehaslimitedtechnicalknowledge,theoldworkerhasllotofexperience.A.SinceB.unlessC.asD.although2.Iwillbeyourtruefriend,_happens.WhateverB.nomatterwhatC.BothAandB3.Ibelieve_yousay.A.WhateverB.nomatterwhat,D,1.Allowchildrenthespacetovoicetheiropinions,_theyaredifferentfromyourown.A.UntilB.evenifC.unlessD.asthough2.-Dad,Ivefinishedmyassignment.-Good,and_youplayorwatchTV,youmustntdisturbme.WheneverB.whetherC.whateverD.nomatter,B,B,_,motherwillwaitforhimtohavedinnertogether.HoweverlateisheB.HoweverheislateC.HoweverishelateD.howeverlateheis2.Youshouldtrytogetagoodnightssleep_muchworkyouhavetodo.HoweverB.nomatterC.althoughD.whatever,D,A,比较状语从句,比较状语从句常由下列词语引导：asas,notso/asas,morethan,lessthan,themore+adj./adv.,themore+adj./adv.,a.Heisnotso/ashealthyashisbrother.b.Theyjumpedupanddownashardastheycould.c.JohnislesscleverthanPeter.d.Thebusierheis,thehappierhefeels.e.ThejobisnotsodifficultasIthoughtitwouldbe.f.Sendforadoctorassoonas(itis)possible.,9.比较状语从句,注意区分不同从句：引导的是什么从句，不仅要根据连词，还要根据句子结构和句意来判别。以where和as为例，能引导多种从句。Youaretofinditwhereyouleftit.（地点状语从句）Tellmetheaddresswherehelives.（定语从句，句中有先行词）Idontknowwherehecamefrom.（宾语从句）Wherehehasgoneisnotknownyet.（主语从句）Thisplaceiswheretheyoncehid.（表语从句）,部分状语从句可用省略形式：evenif,if,once,while,though,unless,when,asifetc.Theflowerhisfriendsgavehimwilldieunless(itis)wateredeveryday.Evenif(Iam)invited,Iwontgothere.Once(youare)caughtsleepinginclass,youllbepunishedbyyourhead-teacher.Though(hewas)surprisedtoseeus,hegaveusawarmwelcome.Shewontspeaktoanyoneunless(sheis)askedto.When(itis)comparedwiththeoldone,ournewhouseisreallylikeapalace.Theseyoungmanvolunteeredtogowherever(theyare)needed.,“as”用于不同的状语从句中1.Shesangassheworked.2.Smartasheis,hedoesntstudyhard.3.YoumusttrytodoasIdid.4.ShedoesntdoherworkascarefullyasI.5.Asshewaslateforclass,shehadtosaysorry.,Rosesneedspecialcare_theycanlivethroughwinter.A.becauseB.sothatC.evenifD.as2.Ifthingsareleft_theyare,theproblemswillneverbesettled,Imafraid.A.howB.asC.whatD.where3.Carefulsurveyshavepointedoutthatasmanyas50percentofthepatientsdonottakedrugs_directed.A.likeB.soC.whichD.as4.Idarenotgothere_myparentswillseeme.A.incaseofB.forfearofC.inorderthatD.forfearthat,同程度比较：As(so)as,thesameas,suchas,表示倍数的三个句型：Aistimesas+形容词原级+asB.Aistimesthe+抽象