▲在交际用语中，人们为了表示礼貌或客气，常用would, could, might 表达现在的婉转请求、建议、疑问或看法。例如：

1. would的用法：

Would you please do me a favor?

Would you mind if I opened the door?

I’d appreciate it if you could be quiet.

Wouldn’t it be great if you explained the reason to us?

除了would之外，could和might也同样可以用来表达现在的婉转请求、建议、疑问或看法。例如：

2. could的用法：

Could you tell me the way to the station? 请告诉我去车站的路好吗？

Could I speak to you in private a moment, John? 约翰，我可以单独跟你说一会儿话吗

Oh, how could you be so stupid? 哎呀，你怎么这么蠢啊！

It's boring to walk all alone. Couldn't you go for walks with your friends? 一个人走路很没意思。你可以和朋友们一起去散步呀？

3. might的用法：

Might I ask what you're doing here? 我可不可以问一下，您在这里干什么？

You might as well bring me a chocolate next time.你下次最好给我带块巧克力来。

I have got a lot of books that might interest you. 我有许多书，也许你感兴趣呢。

The drivers, as you might imagine, don’t care much about that. 和想象中的一样，这些司机对此并不太在意。

【比较】could和might:

Could I use your telephone? （意味着I'm not sure if you will allow me to use your phone.)

Might I use your telephone? （意味着If I don't break it, would you mind my using your phone?) 

▲would, could, might 表示现在时间而非过去时间，是有语境的，那就是“婉转请求、建议、疑问或看法”。但以下句子，would, could, might 则是表示过去。

My son could read and write when he was four. 我儿子4岁时就能读能写了。

He couldn’t have made such a mistake that day. 那天他不能犯这样的错误。

Reed told me he might be late. 瑞德告诉我他可能会迟到。

She opened the windows so that the fresh air might come through. 她打开窗户以便让新鲜空气进来。

She said she would take care of the child. 她说她愿意照顾那个孩子。

Mum would tell us stories before we went to bed. 以前，妈妈在我们上床睡觉前总给我们讲故事。