might have been 和 cound have been的区别

could和might都可用在条件句中，表示假想的情况，表示“本来会、本来可以/能够”。例如：

If you tried you could/might do the work better. 如果你试试的话，准能把那项工作干得更好。

You could have met her if you had gone that way. 如果你走那条路的话，你准能遇见她。

此句中的could如改成might则表示：……，你也许能见到他。

They could/might have worked it out if they had asked me for help. 如果他们来向我求助的话，他们本能够做出来的。

He could/might have give the answer, but he refused to. 他本来能够回答的，但他拒绝这么做。

You were stupid to go skiing there — you could have broken your leg. 你真笨，竟会到那地方滑雪，你本来会摔断腿的。

上面的例句中用might则因其语气较轻而语意效果不甚理想。在此场合，could较might的可能性强。

could和might都可用在表示“结果”的状语从句中，同样，could语气较重些。例如：

He expressed his ideas clearly so that the average person might understand. 他把他的意思清楚地表达出来，以便一般人能听明白。

用于疑问句表示请求时，一般只用could，且可用于各人称。如：

Could you help me explain the difference between "might" and "could"?

Could I use your mobile phone a little while?

上句可用may代替，用might也是可以的，但不常见。

couldn't be + 比较级句型不能用might代替。如：

Their lifestyles couldn't be more different. 他们的生活方式极为不同。

might as well表示“不妨、可以、倒不如”，此时的might是不能用could代替的。例如：

We might as well look for some food now. 现在我们不妨找些吃的东西。

I expect I might as well be going. 我希望我可以走了。

Since it’s a fine day we might as well walk. 既然是一个晴朗的天，我们不妨步行。

We might as well have gone home as you suggested. 我们还不如按你建议的回家去呢。

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