情态动词:
may/might表示允许和可能:
允许: 询问或说明一件事可不可以做.
May I trouble you with a question?
You may take this seat if you like.
He asked if he might glance through my album.
You might as well speak your mind.
可能: 表示一件事或许发生.
You may walk ten miles without seeing a house.
She was afraid they might not like the idea.
A bad thing might be turned to good account.
might 表示请求:
Might I ask for a photograph of your baby?
cant, couldnt表示否定的推测:
She cant be serious.
A more suitable book cant be found.
He couldnt be over fifty.
should, ought to: 表示应该做的事, ought to比should口气稍重一些.
You should do as he says.
You shouldnt talk like that.
但这两者间也有一些差别, 在表示责任, 义务等该做的事情时, 常用ought to, 在表示某件事宜于做时, 多用should, 在下面的句子中这两个词就不宜换用:
You are his father. You ought to take care of him.
We should not use too many big words in our everyday speech.
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