精品文档精品文档PAGEPAGE5精品文档PAGEif引导的条件状语从句（讲义）状语用来
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示行为发生的时间、地点、目的、方式、程度等，平时由副词或介词短语充当，也可由一个句子充当。IsleptathomeyesterdaybecauseIhadabadcold.状语从句状语从句指句子作状语。根据其作用可分为时间、地点、原因、条件、目的、结果、退步、方式等从句。状语从句一般由连词(隶属连词)引导。Iwillgotoschoolbybiketomorrowifitissunny.Grammarfocus—IthinkI’lltakethebustotheparty.—Ifyoudo,you’llbelate.Ifyoutakethebustotheparty,you’llbelate.—IthinkI’llstayathome.—Ifyoudo,you’llbesorry.Ifyoustayathome,you’llbesorry.—Whatwillhappeniftheyhavethepartytoday?—Iftheyhaveittoday,halftheclasswon’tcome.—Shouldweaskpeopletobringfood?—Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolate.1.if在本单元句中意为“；”，用于引导即if引导的是一个完整的句子，所以一定要有主谓，成为从句，另一个句子则成为主句。Ifyougothere,I’llgo,too.Wewillgohikingifitdoesn’traintomorrow.IfBobleavestomorrow,Iwillholdapartyforhimtonight.if引导的条件状语从句既可以放在主句前，也可放在主句后。但是如果放在主句前，即句首时，从句后边要用与主句分开。第1页Youwillkeephealthyifyoudomoreexercise.Ifyoudomoreexercise,youwillkeephealthy.3.时态：if引导的条件状语从句用表示将来，主句可以使用一般将来时，含有情态动词的句子也许祈使句。主将从现IfyoupracticespeakingEnglishmore,youwilllikeitbetter.IfshegoestoNewYorktomorrow,Iwillgothere,too.Mysisterwillbeveryhappyifourunclecomesnextweek.练习：IfNancytheexam,shewillgotoAustraliaforEnglishstudy.A.passB.passedC.passesD.willpassIftheweatherfine,wehaveasportsmeetingnextweekend.A.willbe;willB.is;willC.was;wouldD.was;will主情从现Ifyougetupatsixtomorrowmorning,youcancatchthefirstbus.IfyougotostudyinAmericanextyear,youmustlearnEnglishhard.主祈从现Let’sgooutforawalkifitdoesn’traintomorrow.Ifyouseeasnakeintheforest,don’tmove!unless也可引导条件状语从句，表示“如果不，除非”Unlesshecomeshereinanhour,Iwillgotherealone.Ifhedoesn’tcomehereinanhour,Iwillgotherealone.Youwillfeelworseunlessyougotoseethedoctorrightnow.Youwillfeelworseifyoudon’tgotoseethedoctor练rightnow.习：youreadit,youcan’timaginehowinterestingtheis.storyA.UnlessB.BecauseC.AlthoughD.If—PleasegiveAlicethestorybookyouseeher.—Allright.A.unlessB.orC.butD.if第2页Exercises一、单项选择()1.Studyingingroupsisnecessaryyouwanttodowellinschool.A.ifB.untilC.unlessD.though()2.—Willyouhelpmewiththetrouble?—Iwon’tyoutellmethetruth.A.ifB.butC.afterD.unless()3.IfBobawayfromthejunkfood,hewillbeingoodhealth.A.stayB.willstayC.staysD.stayed()4.IfTomthegame,we’llgivehimsurprisea.A.winB.winsC.wonD.winning()5.We’llgototheparkifittomorrow.A.won’trainB.don’trainC.doesn’trainD.rain()6.Ifyou’recareful,moreyoumuchbetter.A.doB.willdoC.aredoingD.did()7.Iftherenobuyingandsellingofanimals,therenokillinginnature.A.is;willbeB.willbe;willbeC.is;isD.willbe;is()8.I’mwaitingmyforfriend.Ifhe,Iswimmingalone.A.doesnt’come;goB.won’tcome;goC.won’tcome;willgoD.doesn’tcome;willgo二、翻译如果明天不下雨，我会去看你的。Ifittomorrow,Iyou.如果Mary不为考试做准备，她会不及格。IfMarytheexam,shefailtheexam.如果你不告诉我原因，我会告诉妈妈这件事。我不会去医院的，除非你和我一起去那边。第3页【参照
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】Grammarfocus如果；若是；条件状语从句逗号一般现在时主将从现练习：CBunless练习：ADExercises一、单项选择1-5ADCBC6-8BAD二、翻译doesn’train;willvisitdoesn’tpreparefor;willIfyoudon’ttellmethereason,Iwilltellmomthings.Iwon’tgotothehospitalunlessyougotherewithme.4第4页
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