高三情态动词复习课件

youcan*表示推测Youcan’tbeseriousCantheybediscussingtheproblemnow?Hecouldn’thavepostedtheletterHecouldbebusynow（不能用can）*Itcanbeverycoldhereinwinter（偶然可能性）3must必须，youmustNo，必定），didn’tit?4should表示推测，表示“很可能”，youneedn’t(NoYoudon’thaveto)*表示推测（一定，aren’tyou?HemustbewaitingforusatthebusstationItmusthaverainedlastnight，否定式mustn’t“不准”“禁止”MustIhandinthereportbyFriday?Yes，情态动词*表示推测：can’t不可能maynot可能不1CanCanyouspeakEnglish?(能力）Can(Could)Iuseyourpen?（征求许可）Yes，应该，语气较肯定，只用在肯定句中TheremustbesomemistakeYoumustbejoking!Youmustbetired，“该会”Youshould/oughttobehungrybynowIt’sgettinglateJohnshouldbehereatanymomentYoursuitshouldbereadytomorrow情态动词+完成体must+havedone必定已经…can’t/couldn’t+havedone不可能could+havedone本能够做的但未做may/might+havedone本可以做的但却未做should/oughtto+havedone本该做的但实际未做needn’t+havedone本不必做的事却做了，