“may(might)+動詞的完成式”表示“對過去發(fā)生的行為的推測”。

　　may have done 表推測時(shí)，隱含“不確定”。

　　might have done 表推測時(shí)，隱含的“不確定性”比“may have done”更深。

　　He may not have finished the work.

　　他可能還沒有完成那項(xiàng)工作。

　　They may not have known it beforehand.

　　他們事先可能不知道這事兒。

　　You might have read about it in the papers.

　　你可能在報(bào)上已經(jīng)看過這個(gè)消息了。

　　-Whatever has happened to George?

　　-I don't know. He may have got lost.

　　喬治發(fā)生了什么事?

　　我不知道,他可能迷路了。

　　might 表示的可能性比may小,語氣較委婉。例如:

　　How quickly time passed! It might have happened yesterday.

　　時(shí)間過得好快啊!這事好像就發(fā)生在昨天。

　　He might have seen the surprise in my face.

　　他或許已經(jīng)看到了我驚異的表情。