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状语从句指句子用作状语时，起副词作用的句子它可以修饰谓语、非谓语动词、定语、状语或整个句子根据其作用可分为时间、地点、原因、条件、目的、成果、让步、方式和比较等从句状语从句一般由连词（附属连词）引导，也可以由词组引起从句位于句首或句中时一般用逗号与主句隔开，位于句尾时可以不用逗号隔开
1.时间状语从句1时间状语从句常用when,as当..时候，while,before,after,since,till,until,as soon as等连词来引导例如He hadlearned alittle Chinesebefore hecame toChina.After hefinished middleschool,he wentto workin afactory.2在时间状语从句里，主句用未来时态时，从句一般不用未来时态,用目前时态表达未来的动作或状态主将从现例如I11ring youup as soon asI getto NewYork.I willtell himeverything whenhe comesback.He wont believeit untilhe seesit withhis owneyes.主句用肯定式，其含义是“一直到时”，谓语动词只能用延续性⑶在带有till或until引导的时间状语从句的主从复合句里，假如动词假如主句用否认式，其含义是“直到此前不……”,谓语动词可用瞬间性动词例如:The youngman readtill thelight went out.is havingbreakfast.A.until B.while C.because D.though（.江苏省盐都市
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12.1）Scientists sayit maybe afew yearsit ispossibleto testthe newmedicine onpatients.A.because B.after C.before D.since（上海市
37.l）We willhave nowater todrink we dont protectthe earth.A.until B.before C.though D.if（江苏省扬州市41）-Could weplay footballin yourplayground,Sir-No,you havethe principalfs permission（校长许可）.A.if B.unless C.because D.since（四川省成都市
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2.条件状语从句1条件状语从句一般由if,unless除非引导例如:A.so thatB.because C.since D.whenKeys【练习答案】II A2,C
3.B
4.C
5.A
6.C
7.D
8.C
9.C
10.A
11.B
12.C
13.B
14.A
15.C
16.B
17.A
18.D
19.C
20.B真题演习BBBAA CDBCACAACB BBCADBBACAWhat shallwedoifitsnows tomorrowDont leavethe buildingunless Itell you to.2在条件状语从句里，谓语动词一般用目前时态表达未来的动作或状态主将从现例如必考I11help youwith yourEnglish if I amfree tomorrow.He wont be late unlesshe isill.3“祈使句+and or+陈说句”在意思上相称于一种带有条件状语从句的复合句例如Hurry up,or you11be late.=If you don thurry up,you11belate.Study hardand you will pass the exam.=If youstudy hard,youwillpasstheexam.
3.原因状语从句1原因状语从句一般由because,since,as引导例如:He didnt cometo schoolbecause hewas ill.As itis raining,we shallnot gothe zoo.Since youcan tanswer thequestion,I11ask someoneelse.2because表达直接原因，语气最强Because引导的原因状语从句多放在主句之后As和since语气较弱，一般用来表达明显的原因由as和since引导的原因状语从居多放在句首例如----------Why aren,t goingthere----------Because I don twant to.As hehas nocar,he can tgetthere easily.Since wehave nomoney,we can t buyit.3because和so不能同用在一种句子里
4.成果状语从句1成果状语从句由so…that,such…that弓I导例如He is so poorthat he cantbuy abike forhis son.She issuch agood teacherthat everybodylikes her.2so…that与such...that可以互换也许会考例如在由so...that引导的成果状语从句中，so是副词，与形容词连用其构造是...so+形容词副词+that+从句”例如Mother livesso faraway that we hardlyever seeher.在由such…that引导的成果状语从句中，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，也可不带假如是单数可数名词，前面需加不定冠词a或an例o如It wassuch ahot daythat nobodywanted to do anything.有时上述两种构造是可以互换的例如It wassuch awonderful filmthat all of us wanted to see it again.=The filmwas sowonderful thatallofuswantedtoseeitagain.It issuch animportant matchthat nobody wants to miss it.=The matchissoimportant thatnobodywantstomissit.3假如名词前由many,much,little,few等词修饰时,只能用so,不用sucho例如Soon therewere somany deerthat theyate upallthewild roses.He hasso littletime that he can,tgoto thecinema with you.
5.比较状语从句比较状语从句一般由as…as否认not so/as...as,比较级+than…等连词引导例如Tom runsfaster thanJohn does.This classroomis asbig asthat one.
6.目的状语从句1目的状语从句一般由so that,in orderthat引导例如We startedearly so that wecould catchthe firsttrain.He studieshard so that hecould workbetter inthe future.We usedthe computerin orderthat wemight savetime.2so that既可引导目的状语从句，又可引导成果状语从句区别这两种从句的措施有两个1）目的状语从句里往往带有情态动词can,could,may,might等2从意思上看，目的状语从句往往表达的目的很明确例如Speakclearly sothat theymay understandyou.目的状语从句Jack isbadlyill sothathehas torest.成果状语从句
7.让步状语从句1让步状语从句一般由although,though等连词引导例如Though heis young,he knowsa lot.Although Iam tired,I mustgo onworking.2although though与but不能用在同一种句子中例如我们不能说Though itwas raininghard,but he still wentout.应当说Though itwas raininghard,hestill wentout.或It wasraininghard,but hestillwentout.
8.地点状语从句地点状语从句常常由where来引导例如Go whereyou like.Where there isawill,thereisa way.易混引导词while,when的区另!I l.when既可以指时间点，与瞬间动词连用，也可以指”时间段,与延续性动词连用（=while）如:When hecame in,his motherwas cooking.day.When Whilewe wereat school,we wenttothelibrary everyWhile表达时间段，因此，while从句的谓语动词要用延续性动词如:Please donttalk soloud whileothers areworking.
2.Because,as,since的区另!Because用于表达直接原因，回答why提出的问题，语气最强;As用于阐明原因，着重点在主句，常译成由于；since表达显然的或已知的理由或事实,常译成既然如:Water isvery important because wecant livewithout it.He didnrt comeyesterday ashis motherwas ill.1111do itfor yousince youare busy.【实例解析】
1.You willstay healthyyou domore exercise,such asrunningand walking.A.if B.how C.before D.where
2.------Shall wego onworking-----Yes,I preferto havea rest.A.when B.if C.because D.though
3.None ofus knewwhat hadhappened theytold usaboutit.A.when B.until C.after D.though
4.I hopeyou11enjoy yourtrip,dear!-----Thank you,mum.I11give youa callI getthere.A.until B.assoonas C.since D.till考点精炼一.单项填空
1.hesold,hecanstill carrythis heavybag.A.Though B.Since C.For D.So
2.-------Do youknow ifhe toplay basketball withus----I thinkhe will come ifhe free tomorrow.A.comes；is B.comes；will beC.will come；is D.willcome；willbe
3.In thezoo ifa childinto thewater andcantswim,the dolphinsmay comeup him.A.will fall；to helpB.falls；to helpC.will fall；help D.falls；helping
4.Idon t rememberhe workedin thatcity whenhewas young.A.what B.which C.where D.who
5.We willstay athome ifmy auntto visitus tomorrow.A.comesB.come C.willcomeD.is coming
6.The policeasked thechildren crossthe streetthetraffic lightsturned green.A.not；before B.dont；when C.not to；until D.not；after
7.I waslate forclass yesterdaythere wassomethingwrong withmy bike.A.when B.that C.until D.because
8.I’11go swimmingwithyouifIfreetomorrow.A.willbeB.shall beC.am D.was
9.In theexam,the youare,themistakes youwill make.A.careful；little B.more careful；fewestC.more careful；fewer D.more careful；less
10.You shouldfinish yourlessons yougo outto paly.A.before B.after C.when D.while
11.I hurriedI wouldntbelate forclass.A.since B.sothat C.as if D.unless
12.When youread thebook,youdbetter makea markyouhave anyquestions.A.which B.thatC.where D.though
13.The teacherraised hisvoice allthe studentscouldhear him.A.for B.sothatC.because D.in order
14.He tookoff hiscoat hefelt hot.A.because B.as C.ifD.since
15.It isthatwed liketo goout fora walk.A.a lovelyday B.too lovelya dayC.so lovelya dayD.such lovelya day
16.Mary hadmuch worktodothat shestayed ather officeallday.A.such B.so C.too D.very
17.1felt verytired,I triedto finishthe work.A.Although B.Because C.As D.As if
18.the daywent on,the weathergot worse.A.With B.Since C.While D.As
19.well youcan drive,you mustdrive carefully.A.So longas B.In orderthatC.No matterhow D.The moment
20.Write tome assoonasyoutoBeijing.A.will getB.get C.getting D.got真题演习（河北省卷
42.1）Peter likesreading anewspaper he。
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