《情态动词havedone》PPT课件

《《情态动词havedone》PPT课件》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、情态动词+havedone用法对过去已经发生过的情况的推测判断Musthavedone,语气较强，意思是“一定……、肯定……”Itmusthaverainedlastnight,forthegroundiswetthismorning.Can/couldhavedone,can’t/couldn’thavedone,可能，不可能，can的语气比could强Hecan’thavegoneabroad;Isawhimanhourago.---Canhehavepassedtheexam?---No,hecan’thave.Hedidn’tworkhard.may/mig

2、hthavedone，也用于对已经发生过的情况的推测判断，但语气稍弱，意思是“可能，或许……”Shedidn’tgetthereintime.Shemayhavemissedthebus.Hedidn’tcometoschoolyesterday.Hemighthavebeenill.在虚拟条件句中1,与现在事实相反条件句用过去式，主句用should/would/could/might+动词原形IfIwereyou,Iwouldgothere.IfIknewhisphonenumber,Iwouldringhimnow.2,与将来事实相反，条件句用过去式，shoul

3、d+动词原形，wereto+动词原形，主句用should/would/could/might+动词原形Ifitsnowedtomorrow,ourplanwouldbeputoff.（明天很可能不会下雪，计划也不会延期）Ifweshouldcometomorrow,wecouldmeethim.(明天很可能不来，也见不着他)Ifthesunweretoriseinthewest,Iwouldchangemymind.3,与过去事实相反条件句用had+过去分词，主句用should/would/could/might+have+过去分词IfIhadknownthatyo

4、uwerecoming,Iwouldhavepickedyouupattheairport.Ifwehadhadenoughrainlastyear,wecouldhavegainedagoodharvest.can/couldhavedone表示“本来能够做而实际上没有做的事情”Youcouldhavecomeherealittleearlier.你本来可以早点来到这儿的。Shecouldhaveearnedalotofmoney.她本来可以挣一大笔钱的。should/oughttohavedone表示“本来应该做的，而实际上没有做的事情”，其否定形式则表示“已经

5、做了不该做的事情”，含有责备的意思。Theflowershavedied.Ishouldhavewateredthemoften.（其实没浇水）Yououghtnottohavetoldthemthetruth.（其实你告诉他们了）needn’thavedone表示“做了本来不必做的事情”，通常不用于肯定句。It’sonlyfiveminutes’walk.Weneedn’thavetakenataxi.Itiswarmtoday.Youneedn’thavewornyourcoat.1.---IstayedatahotelwhileinNewYork.---Oh,

6、didyou?You___withBarbara.(NMET98)A.couldhavestayB.couldstayC.wouldstayD.musthavestay2.YesterdayJanewalkedawayfordiscussion,otherwise,she___somethingshewouldregretlater.(96上海)A.hadsaidB.saidC.mightsayD.mighthavesaid1.Ididn’thearthephone.I____asleep.(NMET89)A.mustbeB.musthavebeenC.should

7、beD.shouldhavebeen2.---Irangyourhomeyesterday.AmanansweredbutIdidn'trecognizethevoice.---On,it___mybrother,Peter.A.mustbeB.musthavebeenC.canhavebeenD.mightbeYesterday,Janewalkedawayfromthediscussion.Otherwise,she___somethingshewouldregretlater.(1996上海)A.hadsaidB.saidC.mightsayD.might