must have+P.P 与may,might could have +p.p的区别

must have+P.P 与may,might could have +p.p的区别
请再告诉我 may have +P.P.might have +P.P .could have +p.P 之间的区别

must have+P.P是表示对过去发生的事情的肯定推测，“一定已经。。。”的意思。如：I didn't hear the phone,I must have been asleep.(我没听到电话响，那时我一定是睡着了)

may have +P.P.might have +P.P 表示对过去某事做可能性推测，might与may同义，只是其可能性比may更小。如：He is late.He maight have met an accident.(他迟到了，或许出了意外)

could have +p.p通常用否定形式could not have +p.p,或疑问句，表示对过去事情否定或疑问的推测.

1. the trip must have been very interesting.(这是对过去发生的事的肯定推测) 2. keith might not have been home since no one answered the phone.(对过去事物的不太肯定的否定推测) keith couldn't have been home since no one answered the phone.(对过去事物的否定推测)

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