2. might have done 表示未曾实现的可能性

该结构仅限于使用might, 不用may。表示过去本来可以发生，而实际上没有发生的情况，即“过去本来可以做某事，而实际没有做”。通常译为“本来可以”，“本来可能”等。例如：

A lot of men died who might have been saved. 很多人本来可以获救的却死了。

He came home alone. You shouldn’t have let him do that; he might have got lost. 他独自回家了。你本不应当让他那么做的，他可能会迷路的。

You were stupid to try climbing up there. You might have killed yourself. 你从那儿往上爬，太蠢了，你可能会摔死的。

You might have phoned to let us know where you were. 你本来可以打个电话让我们知道你在哪。

有时，也可根据语境译为“好在没有”，“差点”，尤其是当谈论的是不利情况时。如：

It was really very dangerous. You might have injured him. 真是很悬，你差点把他打伤了

It was really very dangerous. I might have killed myself. 那真的是太危险了，我差点没命了。

3. might have done 除了含有上述的意思外，还表示批评或责备

即表示过去本来有责任或义务应该做某事的，但实际上却没有做成，含有批评和责备的意味，通常译为“本来应该”，“本来可以”等，用法同上。例如：

You might have let me know before! 你要是早点让我知道就好了!

She might have told me she was going to stay out all night. 她要是一夜不回来，应事先告诉我一声呀。

You might have taken the trouble to tell me the meeting was put off. 你本来可以费心告诉我一声会议推迟了的。

You might have told us half an hour ago. 你半个钟头前告诉我们就好了。

4. might have done用于虚拟语气

在虚拟条件句中，当谈论过去的情况时，其句型通常是：主句用“could/would/might +have+过去分词”，if从句用过去完成时。例如：

We might have arrived earlier if we had taken the other road.如果我们当时走了另一条路，就可能到得早一些。

If you had left it there, someone might have stolen it. 要是你当时把那东西落在那里，就可能有人把它偷走。

If the weather hadn’t been so bad, we might have gone out. 如果天气不是那么坏，我们可能都出去了。

I might have saved his life if I had found him earlier. 要是我那时早点找到他的话，我可能会把他救活的。

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