题目内容：

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

优质解答

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...