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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.Grammarfocus—IthinkI’lltakethebustotheparty.—Ifyoudo,you’llbela
2、te.Ifyoutakethebustotheparty,you’llbelate.—IthinkI’llstayathome.—Ifyoudo,you’llbesorry.Ifyoustayathome,you’llbesorry.—Whatwillhappeniftheyhavethepartytoday?—Iftheyhaveittoday,halftheclasswon’te.—Shouldweaskpeopletobringfood?—Ifweaskpeopletobringfood,they’lljustbringpotatochipsa
3、ndchocolate.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.2.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，从句后面要用与主句隔开。3.Youwillkeephealthyifyoudomoreexerci
4、se.Ifyoudomoreexercise,youwillkeephealthy.1.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祈使句。主将从现IfyoupracticespeakingEnglishmore,youwilllikeitbetter.IfshegoestoNewYorktomorrow,Iwillgothere,too.Mysisterwillbeveryhappyifouruncleesnextweek.练习：IfNancytheexam,shewillgotoAustraliaforE
5、nglishstudy.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’sgooutforawalkifitdo
6、esn’traintomorrow.Ifyouseeasnakeintheforest,don’tmove!unless也可引导条件状语从句，表示“如果不，除非”Unlessheeshereinanhour,Iwillgotherealone.Ifhedoesn’tehereinanhour,Iwillgotherealone.Youwillfeelworseunlessyougotoseethedoctorrightnow.Youwillfeelworseifyoudon’tgotoseethedoctorrightnow.练习：youreadit
7、,youcan’timaginehowinterestingthestoryis.A.UnlessB.BecauseC.AlthoughD.If—PleasegiveAlicethestorybookyouseeher.—Allright.A.unlessB.orC.butD.ifB.Exercises一、单项选择()1.Studyingingroupsisnecessaryyouwanttodowellinschool.A.ifB.untilC.unlessD.though()2.—Willyouhelpmewiththetrouble?—Iwon
8、’tyoutellmethetruth.A.ifB.butC.afterD.unless()3.IfBoba
