if引導的條件狀語從句（講義）狀語用來表示行為發生的時間、地點、目的、方式、程度等，通常由副詞或介詞短語充當，也可由一個句子充當。IsleptathomeyesterdaybecauseIhadabadcold.狀語從句狀語從句指句子作狀語。狀語從句一般由連詞(從屬連詞)引導。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.if在本單元句中意為“ ； ”，用于引導 。if引導的是一個完整的句子，所以一定要有主謂，成為從句，另一個句子則成為主句。Ifyougothere,I’llgo,too.Wewillgohikingifitdoesn’traintomorrow.IfBobleavestomorrow,Iwillholdapartyforhimtonight.if引導的條件狀語從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時從句后面要用 與主句隔開。Youwillkeephealthyifyoudomoreexercise.Ifyoudomoreexercise,youwillkeephealthy.時態：if引導的條件狀語從句用 表示將來，主句可以使用一般將來時，含有情態動詞的句子或者祈使句。主將從現IfyoupracticespeakingEnglishmore,youwilllikeitbetter.IfshegoestoNewYorktomorrow,Iwillgothere,too.Mysisterwillbeveryhappyifourunclecomesnextweek.練習：IfNancy theexam,shewillgotoAustraliaforEnglishpass B.passed C.passes D.willpassIftheweather fine,we haveasportsmeetingnextweekend.A.willbe;willB.is;will C.was;wouldD.was;will主情從現Ifyougetupatsixtomorrowmorning,youcancatchthefirstbus.IfyougotostudyinAmericanextyear,youmustlearnEnglishhard.主祈從現Let’sgooutforawalkifitdoesn’traintomorrow.Ifyouseeasnakeintheforest,don’tmove!unless也可引導條件狀語從句，表示“如果不，除非”UnlesshecomeshereinanIwillgotherealone.Ifhedoesn’tcomehereinanIwillgotherealone.Youwillfeelworseunlessyougotoseethedoctorrightnow.Youwillfeelworseifyoudon’tgotoseethedoctorrightnow.練習： youreadit,youcan’timaginehowinterestingthestoryis.A.Unless B.Because C.Although D.If—PleasegiveAlicethestorybook yousee—Allright.unless B.or C.but D.ifExercises一、單項選擇( )1.Studyingingroupsisnecessary youwanttodowellinschool.if B.until C.unless D.though( )2.—Willhelpmewiththetrouble?—Iwon’t youtellmethetruth.A.if B.but C.after D.unless( )3.IfBob awayfromthejunkfood,hewillbeingoodhealth.A.stay B.willstay C.stays D.stayed( )4.Ifthegame,we’llgivehimasurprise.A.win B.wins C.won D.winning( )5.gototheparkifit tomorrow.A.won’train B.don’train C.doesn’train D.rain( )6.Ifyou’remorecareful,you muchA.do B.willdo C.aredoing D.did( )7.Ifthere nobuyingandsellingofanimals,there nokillinginnature.A.is;willbe B.willbe;willbeC.is;is D.willbe;is( )8.I’mwaitingformyfriend.he ,I swimmingalone.A.doesn’tcome;go B.won’tcome;goC.won’tcome;willgo D.doesn’tcome;willgo二、翻譯如果明天不下雨，我會去看你的。Ifit tomorrow,I you.Mary不為考試做準備，她會不及格。IfMary theexam,she failtheexam.如果你不告訴我原因，我會告訴媽媽這件事。我不會去醫院的，除非你和我一起去那兒。【參考答案】Grammarfocus逗號一般現在時主將從現練習：C Bunless練習：A DExercises一、單項選擇1-5ADCBC 6-8BA