may和might有什么区别,什么时候用might?

may ,might 或许,可能,可以
（might可以看作是may的过去式,这两个词除了时态不相同外,在表达意思的许多方面是相近的.当然may 和might又都有一些各自不同的独特用法.）
1）可能性
I may be busy from tomorrow on .从明天起我可能会忙起来.
You may catch sight of the sunrise from here when you get up before 5 in the morning .你在早晨五点钟以前起来,或许能从这儿看到日出.
I wondered if they might agree with the idea .我想知道他们是否会同意这种想法.
She thought it might be wise to try her luck here .
她认为在这儿碰碰运气也不错.
2）表示允许
May I come in 我可以进来吗?
I'd like to have a smoke here if I may .
如果可以的话我想在这儿抽一支烟.
The librarian told her that she might return the book to the library in three days .
图书馆理员告诉她说,她可以在三天后还那本书.
At the press conference ,a news reporter asked the chairman if she might trouble him with a question about Taiwan issue.
在记者招待会上,一位新闻记者问大会*她是否能提一个有关台湾问题方面的问题.
3) may间或用来表示祝愿,也常用于表示目的或让步的状语从句中:
May that day come soon .但愿这天早日到来.
May you succeed in winning the first prize in the game .
祝愿你比赛夺冠成功.
May you continue in your efforts and achieve greatersuccesses .
祝愿你继续努力并取得更大的成功.
4) might也常用于表示目的等状语从句中,或用于虚拟语气的结构中:
I could not convince him ,try as I might .我无论用什么样的办法也不能说服他.
They left off earlier on that day so that they might catch the first train .
那天,他们为了赶上头班车动身早一些.
He died so that the others might live .
为了其他的人能活下去,他自己牺牲了.
If you had made better use of your time ,you might have learned more .假若你将自己的时间利用得更好一些,你本可以学到更多东西的.
One error in calculation might ruin the whole project .
计算中出一点错就可能毁掉整个工程.
注意：在回答以may引导的问句时,一般说来避免使用may,以免显得太严厉、或不太客气,而改用其他方式.例如：
--May I come in --Yes ,please .请进.
我可以进来吗?--Sure ./ Certainly ..请进.
--Please don't ..请不要进来.
--No ,you mustn't .不行.

may 可以放在句首也可以放在句中 而MIGHT 要放在句中不能放在句首 MIGHT 在虚拟语气时用的较多 再有就是MIGHT 在作为MAY 的过去试时候用

might 是may 的过去式， 但有时候might 也是可以做情态动词的。

语气委婉的时候用might

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