may和might的区别may和might,must的区别

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may和might的区别may和might,must的区别
may和might的区别
may和might,must的区别

may和might的区别may和might,must的区别
may,might
1) 表示请求和允许.might比 may语气更委婉,而不是过去式.否定回答时可用can’t
或mustn’t,表示“不可以,禁止”.
----Might/ May I smoke in this room?
---- No,you mustn’t.
---- May/Might I take this book out of the room?
---- Yes,you can.(No,you can’t / mustn’t.)
用May I...征徇对方许可时比较正式和客气,而用Can I...在口语中更常见.
2）用于祈使句,表示祝愿.
May you succeed!
3) 表示推测、可能性（不用于疑问句）.
might不是过去式,它所表示的可能性比may小.
1．He may /might be very busy now.
2．Your mother may /might not know the truth.
三、 must
1) 表示必须、必要.
You must come in time.
在回答引出的问句时,如果是否定的,不能用mustn’t（禁止,不准）,而用needn’t,don’t have to（不必）.
---- Must we hand in our exercise books today?
---- Yes,you must.
---- No,you don’t have to / you needn’t.
2) must是说话人的主观看法,而have to则强调客观需要.Must只有一般现在时,have to 有更多的时态形式.
1． he play isn’t interesting,I really must go now.
2． I had to work when I was your age.
3) 表示推测、可能性（只用于肯定的陈述句）
1． You’re Tom’s good friend,so you must know what he likes best.
2． Your mother must be waiting for you now.

语气上的区别 MUST最重 MIGHT最轻

might是may的过去式，may表示委婉的语气也可以表示推测，must表示肯定的猜测

might表示的猜测程度比may小
must表示百分百的猜测而且还有必须的意思

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