I didn't hear the phone.I must have been asleep.
2.否定句中用can/could或may/might表示推测。如:
Though he is busy,he can't/may not refuse your invitation because you are good friends.
The room can't have been cleaned by Li Ping,because she left here half a year ago.
3.疑问句中常用can/could表示推测。如:
— Can he be English?
— No.He can't be English.He must be American.
The dictionary has disappeared.Who could have taken it?
【典例分析】 (2011江苏高考,34)—I left my handbag on the train,but luckily someone gave it to a railway official.
—How unbelievable to get it back!I mean,someone ______ it.
A.will have stolen
B.might have stolen
C.should have stolen
D.must have stolen
答案为B项。句意:——我把我的手提包掉在火车上了。但幸运的是,有人捡到后交给了一位铁路人员。——失而复得,简直难以置信!我是说,本来可能有人会偷了去。will have done sth.为将来完成时;might have done sth.意为“有可能做过某事”,表示对过去的推测,语气较弱;should have done sth.意为“本应该做某事(而实际没做)”;must have done sth.意为“一定做过某事”,表示对过去事情的肯定推测,语气肯定。根据语境和语气判断应选B项,might have stolen表示“有可能偷了去”,语气比较婉转或不肯定。
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