can, could “可能”
may, might “可能,也许”
must “肯定”
should “应该”
He must be at home. 可能性相当大
He should (ought to) be at home. 可能性较大
He can (may) be at home.
有可能但不肯定
He could (might) be at home. 不及上句肯定
3)表示“请求”、“允许”、“应该”、“禁止”等情态动词。
A、can,
could, may, might
都表示请求别人允许或答复,意义上差别不大,往往可以互用。但在语气上表示客气、委婉的程度上有些差别: can (最常用) ---could(较客气)
---may(更正式客气)--- might (最客气)
B、should, ought to, must,had better
had better (最好) ---should (应当) ---ought to (应该) --- must (必须)
C、will, would 表示请求对方做某事,shall 表示征求对方意见或者用于第二、三人称后,表示允诺、命令、威胁、决心、规定等意志,“应当”。
Will you open the window?
Shall I open the window?
Tom shall have a toy if he is a good boy.
(允诺)
You shall not leave your post.
(命令)
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