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1、if引导的条件状语从句（讲义）状语用来表示行为发生的时间、地点、目的、方式、程度等，通常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、让步、方式等从句。状语从句一般由连词（从属连词）引导。Iwillgotoschoolbybiketomorrowifitissunny.GrammarfocusIthinkIlltakethebustotheparty.Ifyoudo,youllbelate.llbelate.tcome.lljustbr
2、ingpotatochipsIfyoutakethebustotheparty,youIthinkIllstayathome.Ifyoudo,youllbesorry.Ifyoustayathome,youllbesorry.Whatwillhappeniftheyhavethepartytoday?Iftheyhaveittoday,halftheclasswonShouldweaskpeopletobringfood?Ifweaskpeopletobringfood,theyandchocolate.1if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
3、从句，另一个句子则成为主句。Ifyougothere,Illgo,too.Wewillgohikingifitdoesntraintomorrow.IfBobleavestomorrow,Iwillholdapartyforhimtonight.2if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，从句后面要用与主句隔开。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或者
4、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;will
5、B.is;willC.was;wouldD.was;will主情从现Ifyougetupatsixtomorrowmorning,youcancatchthefirstbus.IfyougotostudyinAmericanextyear,youmustlearnEnglishhard.主祈从现Letsgooutforawalkifitdoesntraintomorrow.Ifyouseeasnakeintheforest,dontmove!unless也可引导条件状语从句，表示“如果不，除非”Unlesshecomeshereinanhour,Iwillgotherealone.Ifhedo
6、esntcomehereinaour,Iwillgotherealone.Youwillfeelworseunlessyougotoseethedoctorrightnow.Youwillfeelworseifyoudontgotoseethedocto练ightnow.习：youreadit,youcantimaginehowinterestingtisestoryA.UnlessB.BecauseC.AlthoughD.IfPleasegiveAlicethestorybookyouseeher.Allright.A.unlessB.orC.butD.ifExercisesyouwantt
7、odowell、单项选择)1.Studyingingroupsisnecessaryinschool.A.ifB.untilC.uniess)2.Willyouhelpmewiththetrouble?Iwont_youtellmethetruth.B.butC.afterD.thoughA.ifD.uniess)3.IfBobhealth._awayfromthejunkfood,hewillbeingoodA.stayB.willstay)4.IfTomthegame,weA.winB.wins)5.wellgototheparkifitA.wonrain)6.IfyouA.do)7.If
8、there_C.staysD.stayedllgivehimuaprise.C.wonD.winningtomorrow.B.donrainC.doesnrainD.rainrecaorful,youB.willdomuchbetter.C.aredoingD.didandsellingofanimals,therenobuyingnokillinginnature.A.is;willbeC.is;is)8.Imwaitingmyrfriend.swimmingalone.A.doesntcome;goC.wontcomwjllgo二、翻译9. 如果明天不下雨，我会去看你的。Ifittomor
9、row,I10. 如果Mary不为考试做准备，她会不及格。IfMarytheexam,sheB.willbe;willbeD.willbe;isIfhe,IB.wontcomgoD.doesntcome;wgoyou.failtheexam.11. 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儿。【参考答案】Grammarfocus如果；假如；条件状语从句逗号一般现在时主将从现练习：unless练习：9. ADExercises一、单项选择6-8BAD1-5ADCBC二、翻译doesntrain;wiVisitdoesntpreparefcwjllIfyoudonttellmethereason,Iwilltellmomthisg.10. Iwontgotothehospitaluniessyougotherewitle.4
