情态动词的完成时.pptVIP

* 情态动词+ have done 1)must have done 对过去已经发生的事的肯定推测. (只用于肯定句) He must have gone to bed, for the light was out. Where is my pen? I must have lost it. 2)can/could have done 对过去行为的怀疑和不肯定的推测. (常用于否定句和疑问句) 在否定句意为“不可能, 不会是” Mick can’t/couldn’t have found his car, for he came to work by bus this morning.(不可能/不会找到车) Can she have heard from you? 她可能收到你的信吗? 注意: could+ have done 具有两层意思 ①表示对过去发生的事的揣测, 可与can互换. ②表示对过去能做的事而没有做, 不可与can替换. 意为:“本来可以做/能做” ---I stayed at a hotel while in New York. ---Oh. Did you? You could have stayed with Barbara. 有时含有责备或遗憾的意思. You could have done it better. You could have come earlier. 你本可以把这件事做得更好. 你本可以来的更早. 3)may/might have done 表示推测, 可能性更小, 主要用于肯定句. 译为: “或许” He may/might have gone to the library.他或许已经去图书馆了. might +have done 有时含有委婉的 责备或庆幸等感情. 这时不能用may You might have told me earlier. 你本可以早点把消息告诉我的. 4)should have done 表示本应该做 但却未做, 含有“后悔,遗憾,责备, 批评”之意. You should have been more careful. 你本应该更细心些. You shouldn’t have told him about it. 你本不该告诉他这事. 5)needn’t have done 表示“本来用不着, 本不必” 之意. You needn’t have asked him. (But you asked him.) You needn’t have come. I have finished the work. 1.---I stayed at a hotel while in New York. ---Oh, did you? You___with Barbara. A.could have stayed B.could stay C.would stay D.must have stayed A 2.I didn’t see her in the meeting room this morning. She____ at the meeting A.mustn’t have spoken B.shouldn’t have spoken C.needn’t have spoken D.couldn’t have spoken D 3.He___you more help, even though he was busy. A.might have given B.must have given C.can have given D.may give A 4.---I saw our teacher in the office just now. ---You___her, she is still abroad. A.can’t have seen B.mustn’t have seen C.needn’t have seen D.shouldn’t have seen A 5.Kate is already two hours late. What____to h