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1、if引导条件状语从句讲义及if指引的条件状语从句（讲义）状语用来表示行为发生的时间、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。依据其作用可分为时间、地点、原由、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)指引。Iwillgotoschoolbybiketomorrowifitissunny.GrammarfocusIthinkIlltakethebustotheparty.Ifyoudo,youllbelate.Ifyoutaket
2、hebustotheparty,youllbelate.IthinkIllstayathome.Ifyoudo,youllbesorry.Ifyoustayathome,youllbesorry.Whatwillhappeniftheyhavethepartytoday?Iftheyhaveittoday,halftheclasswontcome.Shouldweaskpeopletobringfood?Ifweaskpeopletobringfood,theylljustbringpotatochipsandchocolate.1.if在本单元句中意为“；”，用于指引即if指引的是一个完好的
3、句子，因此必定要有主谓，成为从句，另一个句子则成为主句。Ifyougothere,Illgo,too.Wewillgohikingifitdoesntraintomorrow.IfBobleavestomorrow,Iwillholdapartyforhimtonight.if指引的条件状语从句既可以放在主句前，也可放在主句后。但是假如放在主句前，即句首时，从句后边要用与主句分开。/5第1页Youwillkeephealthyifyoudomoreexercise.Ifyoudomoreexercise,youwillkeephealthy.3.时态：if指引的条件状语从句用表示未来，主句可以
4、使用一般未来时，含有神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,wehaveasportsmeetingnextwe
5、ekend.A.willbe;willB.is;willC.was;wouldD.was;will主情从现Ifyougetupatsixtomorrowmorning,youcancatchthefirstbus.IfyougotostudyinAmericanextyear,youmustlearnEnglishhard.主祈从现Letsgooutforawalkifitdoesntraintomorrow.Ifyouseeasnakeintheforest,dontmove!unless也可指引条件状语从句，表示“假如不，除非”Unlesshecomeshereinanhour,Iwill
6、gotherealone.Ifhedoesntcomehereinanhour,Iwillgotherealone.Youwillfeelworseunlessyougotoseethedoctorrightnow.Youwillfeelworseifyoudontgotoseethedoctor练rightnow.习：youreadit,youcantimaginehowinterestingtheis.storyA.UnlessB.BecauseC.AlthoughD.IfPleasegiveAlicethestorybookyouseeher.Allright.A.unlessB.orC
7、.butD.if第2页Exercises一、单项选择()1.Studyingingroupsisnecessaryyouwanttodowellinschool.A.ifB.untilC.unlessD.though()2.Willyouhelpmewiththetrouble?Iwontyoutellmethetruth.A.ifB.butC.afterD.unless()3.IfBobawayfromthejunkfood,hewillbeingoodhealth.A.stayB.willstayC.staysD.stayed()4.IfTomthegame,wellgivehimsurp
8、risea.A.winB.winsC.wonD.winning()5.Wellgototheparkifittomorrow.A.wontrainB.dontrainC.doesntrainD.rain()6.Ifyourecareful,moreyoumuchbetter.A.doB.willdoC.aredoingD.did()7.Iftherenobuyingandsellingofanimals,therenokillinginnature.A.is;willbeB.willbe;willbeC.is;isD.willbe;is()8.Imwaitingmyforfriend.Ifhe
9、,Iswimmingalone.A.doesntcome;goB.wontcome;goC.wontcome;willgoD.doesntcome;willgo二、翻译11. 假如明日不下雨，我会去看你的。Ifittomorrow,Iyou.假如Mary不为考试做准备，她会不及格。IfMarytheexam,shefailtheexam.假如你不告诉我原由，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9. 【参照答案】Grammarfocus假如；若是；条件状语从句逗号一般此刻时主将从现练习：CBunless练习：ADExercises一、单项选择1-5ADCBC6-8BAD二、翻译doesntrain;willvisitdoesntpreparefor;willIfyoudonttellmethereason,Iwilltellmomthings.Iwontgotothehospitalunlessyougotherewithme.4第4页
