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1、RevisionAdverbialClauseofConditionif引导的条件状语从句&宾语从句-----------复习课Sheisdoingherhomework.Ifyouarehard-working,youwillgetgoodgrades.Shegetsgoodgrades.Ifyouplaycomputergamesonweekdays,you’llbeverytiredinclassyourparentswillbesad.youwon’tgetgoodgrades.youreyeswillbepoor1)
2、条件状语从句通常由if或unless(=ifnot)引导，从句中常用一般时代替将来时，即if或unless后的句子谓语用一般现在时。但是，主句则通常用将来时，情态动词或祈使句。时态－－主将从现主句一般将来时，从句一般现在时1.如果主句是一般将来时，从句则用一般现在时。Ifitrains（从句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（从句）.2.如果主句含有must,may,can等情态动词，从句也要用一般现在时。Ifyoudrivetoofast,youmay
3、haveanaccident.Youmuststopifthetrafficlightisred.3.如果主句是祈使句，从句同样要用一般现在时。Don’tgoandplayfootballifyoudon’tfinishyourhomework.PleasecallmeifhecomesnextSunday.if条件状语从句结构及时态RevisionIf引导条状语从句时，从句中用一般现在时代替一般将来时。1.Ifhe______(go)tothemovies,hewon’tfinishhiswork.goes2.IfI____
4、____(become)adoctor,Icanhelpothers.become3.Ifwe_______(have)time,wewillgototheparktomorrow.have4.如果你去，我也去。Ifyougo,Iwillgo.5.如果明天下雨，请带雨衣。raincoatPleasetakearaincoatifitrains.excellentIfyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespracti
5、ceIfyouwanttogetgoodmarks, dowhat?Don’tdowhat?Ifyouwanttogetgoodmarks,__________.Ifyouwanttogetgoodmarks,don’t__________.studyhardlistentoteacherscarefully.dohomeworkbyyourself.copyyourhomework.talkintheclasscheatintheexamsIf条件句的替代形式：（1）祈使句+and/or+陈述句（谓语动词通常用将来时态）。其
6、中，and表示句意顺承；or表示转折，意为“否则”。e.g.Ifyouworkhard,you’llpasstheexameasily.=Workhard,andyou’llpasstheexameasily.Ifyoudon’tworkhard,you’llfallbehindothers.=Workhard,oryou’llfallbehindothers.verygood（2）用介词with,without的替代形式：e.g.Ifthereisnowater,thefishmaydie.=Fishmaydiewithou
7、twater.Ifyouhelpme,I’llfinishmytaskontime.=Withyourhelp,I’llfinishmytaskontime.if引导的条件状语从句和if引导的宾语从句的区分:If在宾语从句中翻译为“是否”If在条件状语从句中翻译为“如果”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.if在句中的含义不同2.if在从句中的位置不同If引导的宾语从句放在主句之后；而if引导的状语从句可放在主句之前也可放在主句之
8、后=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.If引导的条件状语从句放于句首时多用逗号隔开；而if引导的宾语从句则不能
