状语从句chm2013.ppt

状语从句,Adverbialclauses,九种常用的状语从句,时间状语从句地点状语从句原因状语从句条件状语从句目的状语从句结果状语从句方式状语从句让步状语从句比较状语从句,准确掌握每一个连词的含义是掌握状语从句的关键。,同时要注意时间、条件状语从句主从句的时态一致。即：主将从现,（一）时间状语从句由下列连词引导：when,while,as,whenever,before,after,once,till,until,assoonas,hardly/scarcelywhen,nosoonerthan一些表示时间的副词(短语)或名词短语也可引导时间状语从句:directly,instantly,immediately;bythetime;themoment,thesecond,theminute,theinstant,theyear,theweek,theday;everytime,eachtime,nexttime,thelasttime等,注意:时态一致，一般情况下主句是将来时的时候，从句要用现在时。,高考热点1:1.(11浙江)OneFriday,wewerepackingtoleaveforaweekendaway_mydaughterheardcriesforhelp.A.whenB.whileC.afterD.before2.(10全国)Tomwasabouttoclosethewindow_hisattentionwascaughtbyabird.A.ifB.andC.tillD.when3.(06辽宁)Wewereonthepointofdiscussingfinancialinvestment_thetelephonerangunexpectedlyA.whileB.asC.whenD.once,A,D,C,sbwasdoingsthwhensbwasabouttodo/goingtodo/onthepointofdoingsthwhensbhadjustdonesthwhen,IwasthinkingofthiswhenIheardmynamecalled.Hewasonthepointofleavingwhensomeoneknockedatthedoor.Wehadjustfallenasleepwhenthebellrang.,4.(11福建)ItwasApril29,2011_PrinceWilliamandKateMiddletonwalkedintothepalacehalloftheweddingceremony.A.BeforeB.whenC.sinceD.before5.(05上海)Hetransplantedthelittletreetothegarden_itwasthebesttimeforit.A.thatB.whenC.beforeD.until,B,B,6.（12全国大纲）Ihadhardlygottotheoffice_mywifephonedmetogobackhomeatonce.A.whenB.thanC.untilD.after,A,连接词when的用法小结1.when引导的时间状语从句的谓语动词可以是持续性动作，也可以是表短暂性动作的动词。主句与从句的动作或事情可以同时发生也可以先后发生。2.表示“正在/要做某事，这时突然”相当于“andjustatthis/thattime”。3.在情形下，既然Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalkthereinfiveminutes.,高考热点2:1.（12四川）Atschool,somestudentsareactive_someareshy,yettheycanbegoodfriendswithoneanother.A.whileB.althoughC.soD.as2.（08四川）Insomeplaceswomenareexpectedtoearnmoney_menworkathomeandraisetheirchildren.A.whileB.untilC.whenD.before3._allofthemarestrongcandidates,onlyonewillbechosenforthepost.(11陕西)A.SinceB.AsC.WhileD.If,A,A,C,4._IalwaysfeltIwouldpasstheexam,IneverthoughtIwouldgetanA.（12海南）A.WhileB.OnceC.IfD.Until5.AreyoureadyforSpain?-Yes,Iwantthegirlstoexperiencethat_theyareyoung.(08上海卷)A.whileB.untilC.ifD.before,A,A,1.表“在某一段时间里”、“在期间”、“趁着”,强调从句动作的延续性。Pleasedontinterferewithotherswhiletheyareworking.Strikewhiletheironishot.趁热打铁。(谚)2.表示对比、对照关系,意为“而;却”；一般位于句中。Somepeoplewastefoodwhileothersgohungry.有些人浪费粮食,而有些人却在挨饿。,3.表示让步,意为“尽管;虽然”；通常位于句首。Whileheloveshisstudents,heisverystrictwiththem.虽然他爱他的学生,可是他对学生们很严格。,连接词while的用法小结,as,when,while的用法区别1while引导的时间状语从句的谓语动词必须是可延续的，而when引导的时间状语从句的谓语动词是可延续的，也可以是表短暂性动作的动词。从句动作可发生在主句动作前、后或同时发生。Iwantthegirlstoexperiencethatwhile/whentheyareyoung.WhenIstoppedmycar,amancameuptome.2如表示从句的动作在主句的动作“之前”或“之后”发生时，只能用when引导这个从句，不可用as或while。Whenyouhavefinishedyourwork,youmayhavearest.,(不可用while),3表示“一边.，一边.”“随着”，连词用as，不用when或while。Helookedbehindfromtotimeashewent.Astimegoeson,itsgettingwarmerandwarmer.随着时间的推移，天气变得越来越暖了。,他一边走一边朝后看。,高考热点3:1.Maryrushedhome_sheheardthenews,only_thatherhubbypassedaway.A.assoonas,findingB.directly,tofindC.moment,tofindD.when,found2.Ithoughtherniceandhonest_Imether.A.firsttimeB.forthefirsttimeC.thefirsttimeD.bythefirsttime,B,C,=IthoughtherniceandhonestwhenImetherforthefirsttime.,小结：1.themoment,theminute,theinstantimmediately,directly,instantlyhardly/scarcelywhen,nosoonerthan如果hardly或nosooner或scarcely置于句首，句子必须用部分倒装结构。Ihadhardlygothomewhenitbegantorain.HardlyhadIgothomewhenitbegantorain.,-DidyouremembertogiveMarythemoneyyouowedher?,-Yes,IgaveherthemomentIsawher.,引导时间状语从句，相当于assoonas,2一些含有time的名词短语，如everytime,eachtime,nexttime,thefirsttime,thelasttime,bythetime等，以及theday,theyear,themorning等，也可引导一个时间状语从句。Thedayhereturnedhome,hisfatherwasalreadydead.Eachtimehecametotown,hewouldvisitourschool.,高考热点4:1.Washisfatherverystrictwithhimwhenhewasatschool?Yes.Hehadneverpraisedhim_hebecameoneofthetopstudentsinhisgrade.(03北京春)A.afterB.unlessC.untilD.when2.Itwasverydifficultforustolearnalessoninlife_weveactuallyhadthatinlife.(07天津)A.whenB.sinceC.afterD.until3.Itwasnot_shetookoffherdarkglasses_Irealizedshewasafamousfilmstar.A.when;thatB.until;thatC.until;whenD.when;then,C,D,B,until与till及notuntil/till的用法1.until/till引导时间状语从句用于肯定句时，主句的动词是延续性动词，表示动作或状态一直持续到until/till所表示的时间，意为“直到为止”。用于否定句时，结构为notuntil,主句谓语动词是短暂性动词，意为“直到才”。Hewaiteduntil/tillwefinishedourmeal.Ididntleavethereuntil/tillshecameback.2.从句位于句首仅用untilUntilhetoldme,Iknewnothingaboutit.他告诉我了我才知道。,他一直等到我们吃完饭。,直到她回来，我才离开的。,3notuntil句型中的倒装和强调说法。直到这位大明星摘下墨镜，我才认出她。Ididntrealizeshewasafamousfilmstaruntil/tillshetookoffherdarkglasses.NotuntilshetookoffherdarkglassesdidIrealizeshewasafamousfilmstar.ItwasnotuntilshetookoffherdarkglassesthatIrealizedshewasafamousfilmstar.,高考热点5:1.Johnthinksitwontbelong_heisreadyforhisnewjob.(10陕西)A.afterB.whenC.beforeD.since2.Whydidntyoutellhimaboutthemeeting?(06四川)Herushedoutoftheroom_Icouldsayaword.A.beforeB.untilC.whenD.after3.Asisreported,itis100years_QinghuaUniversitywasfounded.(2011四川)A.sinceB.beforeC.whenD.after4.Thatwasreallyasplendidevening.Itsyears_Ienjoyedmyselfsomuch.A.whenB.thatC.beforeD.since,C,A,A,D,连接词before的小结：一、含义1Wehadsailedfourdaysandfournightsbeforewesawland.2Wehadntrunamilebeforehefelttired.3Pleasewriteitdownbeforeyouforgetit.4BeforeIcouldgetinaword,hehadmeasuredme.,“才”,“不到就”,“趁”,“还没来得及”,二句型1）Itwillbe/was一段时间before“要过多久才/过了多久才”Itwillbetwoyearsbeforeheleavesthecountry.2）Itwillnotbe/wasnot一段时间before“不多久就/没过多久就”Itwasntlongbeforehetoldmeaboutthenews.,since引导的从句Itis/hasbeen+一段时间+since如果从句的谓语动词是短暂性动词的过去式(did)，则表示“自从该动作开始以来”；延续性动词或状态的动词的过去时时(did)，则表示“该动作或状态已经结束”，从句意思是否定的；延续性动词的完成时态(have/hasdone)，则表示“该动作和状态延续”，从句意思是肯定的。Ihaventheardfromhimsincehelivedhere.自从他这里搬走，我就没有收到他的信。ItsthreeyearssinceIwasinthearmy.我退伍已三年了。ItsthreeyearssinceIhavebeeninthearmy.=ItsthreeyearssinceIjoinedthearmy.我入伍已三年了。,（不在服役了）,（在服役）,（不住在这儿了）,Itis100yearssinceQinghuaUniversitywasfounded.,（二）地点状语从句引导地点状语从句的连词是where和wherever等。Youdbettermakeamarkwhereyouhaveanyquestions哪儿有问题，你最好在哪儿做个记号。Wherethereisawill,thereisaway.有志者，事竟成。Sitdownwhereveryoulike.你喜欢坐哪儿就坐哪儿。,Everythingwasplacedexactly_hewanteditforthegraduationceremony.（12天津）A.whileB.whenC.whereD.though_unemploymentandcrimearehigh,itcanbeassumedthatthelatterisduetotheformer.(09江苏)A.BeforeB.WhereC.UnlessD.Until,C,B,高考链接：,原因状语从句是表示原因或理由的。由because(因为),since(既然),now(that)(既然),as(由于),consideringthat(顾及到),seeingthat(由于)等连词引导,但在语气上一个比一个弱。,（三）原因状语从句,because语气最强，表示直接原因，常表示必然的因果关系，引导的原因状语从句是全句意思的重心。用于回答why的提问、引导表语从句、强调句,可与强调词only,just连用,但不可以与so连用。-Whydidntyouphonemelastnight?-BecauseIdidntwanttodisturbyou.Youshouldntgetangryjustbecausesomepeoplespeakillofyou.ItwasbecauseIdidntwanttodisturbyouthatIdidntphoneyoulastnight.,Why,just,Itwasthat,since(既然)：一般表示大家已知的事实，语气比because弱,常置于句首。as(由于)：表示不言而喻、显而易见的的原因，语气最弱。一般放在句首，有时也可放在句末。Since/Nowthatnooneisagainstit,letscarryouttheplan.既然没人反对，让我们实施这一计划吧。for是个并列连词，只能放在另一个并列句后面，且用逗号隔开，表示推理或解释，或用作附加说明。Shemusthavecried,forhereyesarered.,DidyoureturnFredscall?(08北京卷)Ididntneedto_Illseehimtomorrow.A.thoughB.unlessC.whenD.becauseHefounditincreasinglydifficulttoread,_hiseyesightwasbeginningtofail.A.andB.forC.butD.or06北京卷,她一定哭过了，她眼睛红的。,D,B,（四）条件状语从句条件状语从句分为真实条件句和非真实条件句。表示条件的状语从句可以由if（如果）,unless（除非）,incase（如果/万一）,so/aslongas（只要）,onconditionthat（条件是）,suppose/supposing/providing/provided/given(that)（假设)等词或词组引导。,Ifyouleaveat6oclocktomorrowmorning,youdbettergettobednow.2.As/Solongaswedontloseheart,wellfindawaytoovercomethedifficulty.4.Onconditionthatwedontloseheart,wellfindawaytoovercomethedifficulty.5.Onlyifwedontloseheart,willwefindawaytoovercomethedifficulty.只要我们不灰心，我们就能找到克服困难的方法。一般情况下当主句是将来时的时候，从句要用一般现在时。,倒装,willwefind,unless=ifnotHellacceptthejobunlessthesalaryistoolow.Hellacceptthejobifthesalaryisnottoolow.他会接受这项工作的，除非薪水太少(如果薪水不太少的话)。suppose/supposing(that)providing/provided(that)assuming(that)given(that)Suppose/Supposingwecantgetenoughfood,whatshallwedo?假设我们弄不到足够的食物，那我们怎么办？Giventhathesupportsus,wellwintheelection.如果他支持我们，我们就会赢得选举,=if,-Shallwehaveourpicnictomorrow?-_itdoesntrain.(09山东卷)A.UntilB.WhileC.OnceD.If2.Ihaveatightbudgetforthetrip,soImnotgoingtofly_theairlineslowerticketprices.(12上海)A.onceB.ifC.afterD.unless3.Youmayusetheroomasyoulike_youcleanitupafterwards.(09北京卷)A.sofarasB.solongasC.incaseD.evenif4.（12江西）Youcanborrowmycaryoupromisenottodrivetoofast.A.unlessB.evenifC.incaseD.aslongas5._youeatthecorrectfoods_beabletokeepfitandstayhealthy.(08江苏卷)A.Onlyif;willyouB.Onlyif;youwillC.Unless;willyouD.Unless;youwill,D,D,unless相当于ifnot，意思是“除非”“如果不就”。,B,D,A,onlyif引导的条件状语从句位于句首，主句需倒装。,（五）目的状语从句由下列连词引导：sothat,inorderthat,forfearthat唯恐/生怕/为了防止,incase以防(万一)sothat,inorderthat引导的目的状语从句中常需用情态动词。sothat引导的目的状语从句只能放在主句之后inorderthat引导的目的状语从句可以放在主句之前或之后。我们很早出发以便能看到日出。Wesetoutearlysothatwecouldseethesunrise.Inorderthatwecouldseethesunrise,wesetoutearly.forfearthat引导的状语从句谓语动词一般用“should+动词原形”结构，或省略should，表示忧虑，本身带有否定意义，相当于sothatnot,inorderthatnot；incase引导的目的状语从句常用陈述语气。Wehidbehindthebushesforfearthatpassers-byshouldseeus.我们躲在丛林中唯恐过路人看见。PleaseremindmeofitagaintomorrowincaseIforget.明天请再次提醒我以防我忘了。,Leaveyourkeywithyourneighbor_youlockyourselfoutoneday.（12辽宁）A.aslongasB.eventhoughC.incaseD.asifHesworkinghardforfearthathe_.A.shouldfallbehindB.fellbehindC.mayfallbehindD.wouldfallenbehind,A,C,连接词“forfearthat”可以用来引导虚拟语气。其形式通常为：“forfearthat+主语+should+动词原形”，should可以省去。IwillnotmakeanoiseforfearthatI(should)disturbyou.我不会做声的，以免打扰你。,高考链接：,（六）结果状语从句结果状语从句是表示事态结果的从句,通常主句是原因,从句是果。由so/suchthat,sothat等引导。so/suchthat注意点：so+adj/adv+thatsuch(a/an+adj)+n+thatso+adj+a/an+n+that=sucha/an+adj+n/thatsomany/much/few/little(少)+n+thatsuch+(adj)+n.(u/pl)+thatHewassoexcitedthathecouldnthelpjumping.他兴奋得忍不住跳了起来。Itwassuchaterribleaccidentthatfewpeoplesurvived.Itwassoterribleanaccidentthatfewpeoplesurvived.那是一起可怕的事故，几乎没有人幸存。sothat从句谓语一般没有情态动词Shewasill,sothatshedidntattendthemeeting.,Hehassofewfriendsthatheoftenfeelslonely.他朋友很少，所以经常感到孤独。IhadsolittlemoneythenthatIcouldntaffordalittlepresent.我当时囊中羞涩连一份小小礼物都买不起ThebookwaswritteninsuchsimpleEnglishthatwecouldunderstanditeasily.这本书是用很简单的英语写的，我们能很容易地理解。so或such置于句首时，主句常倒装(部分倒装)。Hewassoexcitedthathecouldnthelpjumping.=Soexcitedwashethathecouldnthelpjumping.Shespokesoloudlythateveryoneinthebighallcanhearher.=Soloudlydidshespeakthateveryoneinthebighallcanhearher.,1.Theweatherwassocold_Ididntliketoleavemyroom.2.Peterwassoexcited_hereceivedaninvitationfromhisfriendtovisitChongqing.（09重庆卷）A.whereB.thatC.whyD.when,B,D,注意以上结构与定语从句so/suchas的区别。Thisissuchaninteresting/sointerestingafilm_everyonewantstoseeit.Thisissuchaninteresting/sointerestingafilm_everyonewantstosee.,that,as,（七）方式状语从句方式状语从句常由as,asif(though),theway等引导。DoinRomeastheRomansdo.入乡随俗Leavethingsastheyare.让一切顺其自然。Doitthewayyouweretoldto.教你怎样做就怎样做。HetreatsmeasifIwereastranger.他对待我象陌生人一样。注意：as引导方式状语从句时意义为“按照”，“如同”，前面常用加强语势。Ididitjustasyoutoldme.Alwaysdototheothersasyouwouldbedoneby.你希望人家怎样待你，你就要怎样待人。,=Ididitjustastoldto,asif,asthough两者的意义和用法相同,引出的状语从句谓语多用虚拟语气,表示与事实相反；有时也用陈述语气,表示所说情况是事实或实现的可能性较大。常译作“仿佛似的“,”好像似的”Theycompletelyignorethesefactsasif(asthough)theyneverexisted.他们完全忽略了这些事实，就仿佛它不存在似的。Helooksasif(asthough)hehadbeenhitbylighting.他那样子就像被雷击了似的。Itlooksasiftheweathermaypickupverysoon.看来天气很快就会好起来。,（八）让步状语从句让步状语从句由although/though（尽管）,evenif/eventhough（即使）,whether(是否),however(无论怎样),whatever,whoever,whomever,whichever,whenever,wherever,nomatterwh-(无论),等词引导。Wewontbediscouragedevenif(=eventhough)wefailtentimes.我们即使失败十次也不泄气。Whatever(=Nomatterwhat)yousay,Illneverchangemymind.无论你说什么，我永远不会改变主张。注意：although,though引导让步状语从句时,主句前不能用but,但可以加yet,still。Thoughwewereshortofmaterials,westillmanagedtofinishtheworkontime.【though还可作副词，放在句末用逗号隔开，表示“不过，然而”】Wewereshortofmaterials.Westillmanagedtofinishtheworkontime,though.,as引导让步状语从句时，必须用前置结构，通常是从句中的表语(名词、形容词)、状语或动词原形放在句首，放在句首的名词前的冠词要去掉。ThoughMaryisagirl,shecandowhatboysdo.=GirlasMaryis,shecandowhatboysdo.WhileIamwillingtohelp,Idonthavemuchtimetoafford.=WillingasIamtohelp,Idonthavemuchtimetoafford.ThoughIhavebeenworkingveryhard,Imadelittleprogress.=HardasIhavebeenworking,Imadelittleprogress.Thoughhemighttry,thedoorwouldntopen.=Tryashemight,thedoorwouldntopen.,（在girl前不要用冠词）,whether-or(not)引导的从句，提供两个对比的“尽管”情况，含有条件意味。Whetheryoucomehereorwegothere,thetopicofdiscussionwillremainunchanged.疑问词+evernomatter+疑问词Wheneveryoucome,youarewelcome.Whoeverbreaksthelaw,hewillbepunished.(比较)Whoeverbreaksthelawwillbepunished.,(Whenever=nomatterwhen),(Whoever=nomatterwho),(Whoever=anyonewho),_theInternetisofgreathelp.Idontthinkitsagoodideatospendtoomuchtimeonit.(08湖南卷)A.IfB.WhileC.BecauseD.As2.Allowchildrenthespacetovoicetheiropinions,_theyaredifferentfromyourown.(05湖南卷）A.untilB.evenifC.unlessD.asthough,B,B,evenif等于eventhough，表示“即使、尽管”,有退一步设想的意味。asthough等于asif，引导方式状语从句，表示“好像、似乎”。,while引导让步状语从句，表示“尽管”。,高考链接：,（九）比较状语从句比较状语从句常用:than；asas；notso(as)as；the+比较级，the+比较级(越越)等引导。注意：这类从句常以省略形式出现。Hedoesntworkashardasshe(does).他工作不像她那样努力。OurcountryisasbigasthewholeofEurope.我们的国家同整个欧洲一样大。Theresultwasnotas/sogoodasIhadexpected.结果不如我预料的那么好。Themorecarefulyouare,thefewermistakesyouwillmake.你越细心犯错误就越少。,1.Johnplaysfootball_,ifnotbetterthan,David.A.aswellB.aswellasC.sowellD.sowellas2.HespeaksEnglishwellindeed,butofcoursenot_anativespeaker.(2004上海)A.asfluentasB.morefluentthanC.sofluentlyasD.muchfluentlythan3.Ourneighbourhas_ours.(2003北京)A.asabighouseasB.asbigahouseasC.thesamebighouseasD.ahousethesamebigas,as+形容词+a/an+单数名词+as,高考链接：,4.AlthoughLindatriedhardintheexam,shedid_thanherbrother.(00上海春)A.morebadlyB.muchbetterC.muchbadlyD.muchworse5.-Howdidyoufindyourvisittothemuseum?-Ithoroughlyenjoyedit.Itwas_thanIexpected.A.farmoreinterestingB.evenmoreinterestedC.somoreinterestingD.alotmoreinterested,比较级前可用修饰语even,still,rather,abit,alittle,some,any,much,alot,yet,far,byfar.不能用very,too,so,fairly,quite,more,6.Itsbelievedthat_youwork,_resultyoullget.A.theharder;thebetterB.themorehard;themorebetterC.theharder;abetterD.morehard;morebetter7.ItisreportedthattheUnitedStatesuses_energyasthewholeofEurope.(广西)A.astwiceB.twicemuchC.twicemuchasD.twiceasmuch8.Americanseat_vegetablesperpersontodayastheydidin1910.(上海)A.morethantwiceB.astwiceasmanyC.twiceasmanyasD.morethantwiceasmany,倍数表达法,倍数表达法,倍数+as+原级+as倍数+比较+than倍数+the+n.+of倍数+whatitis倍数+thatof,asmuch+n.u+asasmany+n.(pl.)+as,MuchasIrespecthim,Icantagreetohissuggestion.,DoinRomeastheRomansdo.,HespeaksEnglishaswellashespeakshismothertongue.,Theywaiteduntilitwasdarkbeforeleaving,astheydidntwantanyonetoseethemleave.,Hehurriedhome,lookingbehindashewent.,表时间,表让步(=though)(倒装),表方式,表原因,表比较,判断下列as引导的状语从句的类别,他匆忙赶回家，边走边往后看。,他讲英语和说母语一样的好。,入乡随俗。,尽管我非常尊敬他但我不赞同他的建议。,他们一直等到天黑才离开的，因为他们不想任何人看到他们离开。,状语从句的时态问题Iftheirmarketingplanssucceed,they_theirsalesby20percent.(08全国卷II)A.willincreaseB.havebeenincreasingC.haveincreasedD.wouldbeincreasingSendmyregardstoyourlovelywifewhenyou_home.(06上海卷)A.wroteB.willwriteC.havewrittenD.write_leaveattheendofthismonth.Idontthinkyoushoulddothatuntil_anotherjob.(06北京卷)A.Imgoingto;youdfoundB.Ill;youdfindC.Ill;youllfindD.Imgoingto;youvefound,A,D,D,Nodecision_aboutanyfutureappointmentuntilallthecandidateshavebeeninterviewed.(08北京卷)A.willbemadeB.ismadeC.isbeingmadeD.hasbeenmadeHowevermuch_,itwillbeworththeprize.A.doesthewatchcostB.coststhewatchC.thewatchwillcostD.thewatchcosts,A,D,在条件，时间和让步从句中，用一般现在时表示一般将来时，用现在完成时表将来完成时，用一般过去时表过去将来时。,状语从句的倒装问题1.Sosudden_thattheenemyhadnotimetoescape.A.didtheattackB.theattackdidC.wastheattackD.theattackwas2.Notuntilthemotorbikelookedalmostnew_repairingandcleaningit.(08陕西卷)A.hestoppedB.didhestopC.stoppedheD.hedidstop3._hetalksalotabouthisfavoritesingersafterclass.重庆A.AquietstudentashemaybeB.QuietstudentashemaybeC.BeaquietstudentashemayD.Quietashemaybeastudent,C,B,B,状语从句的倒装一般有下面几种情况：否定词开头；so加adj.开头；as/though引导的让步状语从句；only+if/when/after等引导的状语从句位于句首。,C,4.Itwasannouncedthatonlywhenthefirewasundercontrol_toreturntotheirhomes.(08江西卷)A.theresidentswouldbepermittedB.hadtheresidentsbeenpermittedC.wouldtheresidentsbepermittedD.theresidentshadbeenpermitted,有些时间、地点、条件、方式或让步从句，如果从句的主语与主句主语一致或者主语是it，从句的谓语又包含动词be，就可省略从句中的“主语+be”部分。,状语从句中从句的省略现象,（1）连接词+过去分词/现在分词Dontspeakuntilyouarespokento.SheadvisedmenottosayanythingunlessIwasasked.她劝我别说什么，除非有人要我说。Lookoutforcarswhencrossingthestreet.过街时当心车辆。,(),(),(=whenyouarecrossingthestreet.),（2）连词+形容词/其他常见的有ifnecessary、ifpossible、whennecessary、ifany等。Shelefttheroomhurriedlyasifangry.她急匆匆地走出屋去，好象很生气的样子。Ifpossible,Idliketohavetwocopiesofit.可能的话，我想要两本。,(=asifshewas/wereangry.),(=ifitispossible,.),1.Though_manytimes,Davidoftendrivesafterdrinking.A.tobewarnedB.havingbeenwarningCwarnedD.beingwarned2.Hesucceededinsolvingalltheproblems_.A.asexpectedB.asexpectingC.thanexpectedD.thanexpecting3.Theofficialssoonrealizedthat,_,thingswouldgetworse.A.unlessdealtwithitproperlyB.ifnotproperlydealingwithitC.unlessproperlydealtwithD.ifdealtnotproperlywith4.Dongling,since_unearthed,hasbeenundertheprotectionofthestategovernment.A.beingB.itbeingC.itisD.was,C,A,C,A,havingbeenwarned,ashehadbeenexpected,unlesstheywereproperlydealtwith,(),ifnotproperlydealtwith,(),Thoughhehasbeenwarnedmanytimes,(),sinceitwasunearthed,这种新材料自从发明问世以来就一直被人们广泛使用。,since,prep.,conj.,Thisnewmaterialhasalwaysbeeninwideusesincebeinginvented.,Thisnewmaterialhasalwaysbeeninwideusesincetheywereinvented.,before/after,prep.,conj.,Newideassometimeshavetowaitforyearsbefore_.FullyacceptedB.beingfullyacceptedC.havingfullyreceivedD.Havingbeenfullyreceived,B,状语从句与名词性从句_wantstostayinahotelhastopayhisownway._wantstostayinahotel,hewillhavetopayhisownway.A.AnyoneB.nomatterwhoC.WhoeverD.Who,C,B/C,wh-ever即可引导让步状语从句又可