bedroom.Who could have done it?

有人闯入了我的卧室。会是谁呢？

3)should/ought to + have done：表示过去该做某事而没有做的情况，也表示说话人后悔、遗憾或责备的语气。shouldn't/oughtn't to + have done：表示过去不该做某事却已经做了的情况，也表示说话人后悔或责备的语气。如：

You shouldn't have thrown all the books.

你不该扔了全部的书。

4)could + have done：表示本来能够做却没有做某事，是说话人责备的语气。如：

Oh,the train has left.You could have got up earlier.

噢，火车已经开了。你本来可以早点起床啊。

注意：could + have done也可以对过去进行推测，表示"可能已经做......了"。如：

-Where was your sister then?当时你姐姐在哪？

-She could have gone swimming with some friends.她可能和一些朋友游泳去了。

5)needn't + have done：表示原本不必做某事却已经做了的情况。如：

You needn't have apologized to her.It was not your fault.

你本不必向她道歉，那不是你的错。

6)would rather have done：表示本来想做某事却未做成的意思。如