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may/might have done 推测过去 may/might+动词的完成式表示对过去发生的行为的推测。例如： -Whatever has happened to George? -乔治发生了什么事? -I dont know. He may have got lost. -我不知道，他可能迷路了。 You might have read about it in the papers. 你可能在报上已经看过这个消息了。 (之前我们做过can have done用法小结，can have done表推测时都是对过去进行推测，但是may have done不仅可以推测过去) may/might have done 推测现在 may/might+动词的完成式表示对现在情况的推测。例如： She might have got up now. 现在她可能已经起床了。 may/might have done 预测未来 may/might+动词的完成式表示推测将来某时之前的情况。例如： He may have left when you get there. 等你到达的时候他可能已经离开了。 注意：may have done 和 might have done 表推测时，might 所表示的可能性比 may 小，语气较委婉： How quickly time passed! It might have happened yesterday. 时间过得好快啊!这事好像就发生在昨天。 | 
