资源描述：
《Unit 4《Period Four Grammar and usage》课件2》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Unit4HelpingpeoplearoundtheworldGrammar&UsageSubjunctiveMood虚拟语气Revision虚拟语气1）概念 虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。2）在条件句中的应用 条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。在条件状语从句和结果状语从句中,表示与事实相反的条件和结果。1)与现在事实相反：If主语…,主语+V原2)与过去事实相反：If主语,主语
2、+haveVe3)与将来事实相反：If主语…,主语+V原wereV-edshould(wouldcould,might)should(wouldcould,might)shouldweretoshould(wouldcould,might)hadVed虚拟语气假设条件句型注意点：1.假设条件从句谓语动词发生的时间与主句所假设的谓语动词不一致，叫做错综条件虚拟语气。主句和从句的谓语动词要依照假设的时间而顶。Iftheweatherhadbeenfiner,thecropswouldbegrowingstillbetter.Ifyou
3、hadfollowedtheteacher’sadvice,youwouldn’tbeinthehospital.2.假设条件虚拟倒装。条件从句中有should，were，had三个助动词可以把if省略，并将这三个词提至句首。IfIwereyou,Iwouldgiveitup.WereIyou,Iwouldgiveitup.Ifitwerenotforyouradvice,wecouldn’thavegotoverthedifficulties.Wereitnotforyouradvice,wecouldn’thavegotove
4、rthedifficulties.IfIhadhadtime,Iwouldhaverunroundthatlakeagain.HadIhadtime,Iwouldhaverunroundthatlakeagain.Ifthereshouldbeaflood,whatshouldwedo?Shouldtherebeaflood,whatshouldwedo?注意： 在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was，即在从句中be用were代替。IfIwereyou,Iwouldgotolookforhim.
5、如果我是你，就会去找他。Ifhewerehere,everythingwouldbeallright.如果他在这儿，一切都会好的。典型例题_____todothework,Ishoulddoitsomeotherday. A.IfwereIB.IwereC.WereID.WasI在虚拟条件状语中如果有were,should,had这三个词主语提前,变成were,should,had+主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说WereInottodo.,而不能说Weren't
6、Itodo.Hadyoulistenedtothedoctor,you_________allrightnow.A.areB.wereC.wouldbeD.wouldhavebeen2.__________anychangeaboutthedate,pleasetellmeimmediately.A.WilltherebeB.ShouldtherebeC.TherewillbeD.Thereshouldbe3.__________today,hewouldgettherebyFriday.A.WouldheleaveB.Washe
7、leavingC.WerehetoleaveD.IfheleavePractise:4.Shoulditrain,thecrops_____.A.wouldbesavedB.wouldhavebeensavedC.willbesavedD.hadbeensaved5.You_____comeearlier.Thebusleftamomentago.A.wouldB.shouldhaveC.mayD.have6.Whatshouldwedoifit_____tomorrow?A.shouldsnowB.wouldsnowC.snow
8、D.willsnow7.You_____suchaseriousmistakeifyouhadfollowedhisadvice.A.maynotmakeB.mightnotmakeC.shouldn’thavemadeD.mightnothave
