情态动词讲义.ppt

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1、情态动词常见的情态动词有can,could,may,might,must,need,haveto,should等.所有的情态动词后面都接动词原形.Eg:Icanswim.Hehastogonow.1.（1）can能够,会,可以，表示现在的能力Eg:IcanspeakEnglishwell.Canyoutellmehowtostartthemachine?此外,can用来表示否定推测和疑问推测Eg:Thatcan’tbeourEnglishteacherbecauseshehasgonetoShanghai.Canitbetrue?（2）co

2、uld表示过去的能力（3）beableto表能力，可用于多种时态强调成功的做成了某事2.may可以,可能,也许Eg:Youmaygowithme.---MayIborrowyourpen?---Yes,youmay.No,you_______________can’t/mustn’t.此外,may表示可能时注意和maybe的区别maybe可能(副词),不能做谓语,常在前面Eg:Maybeyouknowtheoldman.=Youmayknowtheoldman.may常放在句中,和动词原形一起做谓语1)Idon’tknow._______h

3、ecantellyou.2)Idon’tknow.He______tellyou.Maybemay3.must必须mustn’t严禁,禁止,不许Eg:Imustlearnhowtowork.Youmustn’tplayinthestreet.---MustIfinishtheworknow?---Yes,youmust.No,youneedn’t/don’thaveto(不必）.此外must用于肯定推测,表示肯定是Eg:Thebookmustbelongtohimbecausewecanseehisnameonit.4.need需要既可以做

4、实义动词也可以做情态动词实义动词needtodosth需要做某事Eg:Ineedtobuyabighouse.---Doyouneedtobuyabighouse?---Yes,Ido.No,Idon’t.Heneedstoborrowamap.---Doesheneedtoborrowamap?2)情态动词needdosth需要做某事Eg:Ineedbuyabighouse.5.haveto不得不Eg:It’seleveno’clock.Ihavetogonow.Hehastofinishtheworkfirst.请注意:Idon’tha

5、vetogonow.Hedoesn’thavetofinishtheworkfirst.haveto和must的区别:haveto表示客观因素Eg:Weareverygladattheparty,butit’s11,sowehavetoleavenow.must表示主观因素Eg:Wemuststudyhardtofindagoodjobforourselves.6.You’dbetterdosth你最好做某事Eg:You’dbetterbuythebook.You’dbetternotdosth你最好不要做某事You’dbetternotr

6、unintheclassroom.