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定义：在复合句中，修饰主句中的动词，形容词或副词等的从句★根据所表达的意思时间(when,while,before,after,until…)※while引导的从句，谓语动词必须是延续性动词，（一般引导进行时态）例：①Don’ttalksoloudwhilethebabyissleeping.②WhileIwaswonderingwhattosay,Marycameintotheroom.※WhenIlivedthere,Iusedtogoswimming.Hewasonlytenwhenhebegantowork.when引导从句，从句的谓语动词既可是延续性动词，也可是非延续性动词条件(if,unless,as(so)longas…)例：Ifitrainstomorrow,Iwon’tgotoschool.原因(because,so,since,as…)例：Shedidn’tcomebecauseshewasill.※because和so不能连用结果(so…that,such(a/an)…that)★so+形容词/副词such+名词例：①Therearesomanybooksintheroomthatyoucan’treadthemallinaday.②Itissuchfineweatherthatwewantgotocamping.★so+many/few+可数复数much/little+不可数名词+that从句目的(sothat,inorderthat…)例：IgotupearlysothatIcancatchthefirstbus.让步(though,although,even,if…)例：Althoughheispoor,hehasalotoffamousbooks.※though,although不能与but连用比较(as,asif,asthough,than…)例：①ItseemsasthoughanewresortareaSpringsupeverydaywherethereissunandsea.②Heistallerthanhefarther(is).③Indeed,thegrouthrateoftourismhasgengerallybeengreaterthanthatoftheworldconomy.※比较状语从句的谓语常省略地点(where,wherever…)例：Wherethereisawill,thereisaroad.※where前不可用介词主动过去时，从句用过去某时：例：IwaswatchingTVwhensheknockedatthedoor.主句将来时，从句用将来时（时间和条件状语从句用一般现在时表将来：例：I’llgotoseeyouassoonasIgetthere.I’llgowithyouifIhavetime.BDB()1Themeetingdidn'tstart___everyonewasthere.A.becauseB.untilC.whyD.if()2Theboy___tobed___hismothercamein.A.wentnot;untilB.didn'tgo;afterC.went;untilD.didn'tgo;until()3Iwon'tbelieveyou___Ihaveseenitwithmyowneyes.A.beforeB.untilC.afterD.whenADA•()4He___home___shewassatisfied___hisansweryesterday.A.didn'tgo;until;withB.wasn'tgo;after;toC.doesn'tgo;before;withD.didn'tgo;until;to•()5He___backuntilthework___done.A.isn't;willbeB.isn't;isC.won'tbe;willbeD.won'tbe;is•()6Theydidn'tstartthework___theirteachercameback.A.untilB.whileC.assoonasD.ifCDB•()1Tomwillcallmeassoonashe___Shanghai.A.arrivesB.willreachC.arrivesinD.getto•()2I'msurehe'llcometoseemebeforehe___Beijing.A.willleaveB.isleavingC.leaveD.leaves•()3Iwilltellhimthenewsassoonashe___back.A.comeB.comesC.willcomeD.cameDBC•()1Tomhasgotawatch.He___itfortwoyears.It_______byhisfather.A.hasbought;wasboughtB.hasgot;isbought,C.wasbought;hasbought.D.hashad;wasbought'()2Whenhegottothestation,thetrain___.A.leftB.hadleftC.leavesD.hasleft•()3Theboytoldhisfatherwhathe___inthestreet.A.sawB.haveseenC.hadseenD.seeBA•()4We___TVwhenthetelephone____.A.watched;wasringingB.werewatching;rangC.watch;ringsD.arewatching;rang()5Bytheendoflastterm,I___tenbooks.A.hadfinishedreadingB.havefinishreadingC.hadfinishtoreadD.finishreadCBB•()1I___youforalongtime.Where___you___?A.didn'tsee;did;goB.didn'tsee;have;goneC.haven'tseen;have;beenD.haven'tseen;have;gone()2Tom___Chinafor3years.A.hasbeenB.hasbeeninC.hasbeentoD.hasbeenat()3Iwon'tgotoseethefilmtonight,becauseI___myticket.A.lostB.havelostC.willloseD.didn'tloseDBC•()4-Hello!MayIspeaktoBob?-Sorry,buthe___foramonth.A.hadbeenawayB.wasleftC.leftD.hasbeenaway()5I___himsinceIbegantoliveinthecity.A.knowB.haveknownC.knewD.willknow()6ZhaoLan___already___inthisschoolfortwoyears.A.was;studyingB.will;studyC.has;studiedD.are;studyingABB•()1Bettydidn'tgotoseethefilmyesterday___shewasill.A.becauseB.butC.untilD.if()2MayIsitnearer___Icanseemoreclearly?A.asifB.sothatC.evenifD.so()3___youworkhard,youwillcertainlysucceed.A.ThoughB.IfC.BecauseD.ForCC•()4___hecametostudyintheuniversity,hehasmademuchprogressinthestudyofEnglish.A.WhileB.WhenC.SinceD.After()5I'dliketogoswimming_____thewaterisnottoocold.A.forB.unlessC.ifD.whetherDABB•()1Thereare___manyleaguemembersinclass2___inClass4.A.both;andB.'so;thatC.either;orD.as;as()2-Doyouhaveabiglibrary?-No,wedon't.Atleast,not___yours.A.asbigasB.asbigthanC.asbiggerthanD.biggeras()3Suzhouisnot____beautiful____Hangzhou.A.as;thanB.so;asC.even;thanD./;than()4Ironismoreuseful___anyothermetal.A.asB.thanC.thenD.soAACC•()1Iwanttoknow___sheisgoingtoseeafilm.A.ifB.thatC.whatD.which()2Youaresuretopasstheexam___youstudyhard.A.ifB.thoughC.thatD.since()3I'llgotoseethefilmwithyou___Ihavetimethisevening.A.whetherB.soC.ifD.when()4___youstudyharder,you'llneverpassthefinalexam.A.IfB.UntilC.UnlessD.ExceptCDD•()1Althoughitwasraining,oostillworkedinthefields.A.buttheyB.andtheyC.theyD.andyetthey()2___therewereonlyfivesoldiersleftatthefront,___theywentonfighting.A.Because;soB.If;andC.Though;butD.Though;/()3___sheisveryold,___shecanstillworkeighthoursaday.A.Because;soB.Though;butC.As;yetD.Though;yetCBBC•()1Pleaseanswerthequestioninaloudenoughvoice___alltheclassmayhear.A.so,thatB.orC.inorderthatD.and()2Liftitup___Imayseeit.A.thoughB.sothatC.asD.than()3Ihurried___Iwouldn'tbelateforclass.A.soB.sothatC.ifD.unless()4Weshouldgobybus___wecangetthereearlier.A.assoonasB.whereC.inorderthatD.asCCBB•()1Thedictionaryissoexpensive___Ican'tbuyit.A.becauseB.whenC.thatD.if()2Igotthere___late___Ididn'tseehim.A.too;toB.such;thatC.so;thatD.so;as()3Itis___hotintheroom___wehavetogooutforawalk.A.such;thatB.so;thatC.as;asD.such;as()4Hehas___aninterestingbookthatwewanttoreadit.A.soB.suchC.thesameD.as