一张图简述常用情态动词
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May I know your name?
I wonder if I might have more salad. (委婉用法)
Yes, of course you may.
Studentsmay notstay out of the dormitory after midnight without written permission.
4.can’t help but do只能I can’t help but wait.
可能(possibility)
事物实际发生的可能性
Can/Could the news be true?
多用否定
It can’t /couldn’t be true.
may／might
许可(permission)可以
You must be mad to do that.
You must have difficulty getting the tickets.
You can’t have any difficulty getting the tickets.
(这里也可以用ought to)
must
责任和义务(obligation)必须
You must be back by ten o’clock.
Must you leave so soon?
No, I needn’t.
一定,肯定(logical necessity)
极大的可能性（只能肯定，否定为can’t）
情态动词
非推测性用法
推测性用法
can／could
1.能力(ability)能
He can speak English and Japanese.
He could explain what had happened. (他能做出解释，但可能没有说。)
He was able to explain what had happened.
可能(possibility)
可能性大may，小might
Tom may lend you the bike. (可能性大= It is very likely that...)
Tom might lend you the bike.(可能性小= I think it is unlikely.)
will／would
意愿(volition)
1.人作主语表愿意
Will you go with us?
Would you let mห้องสมุดไป่ตู้ hear from you soon?Yes, I will.
2.物作主语表性能、能力
Oil will float on water.The door won’t open.
预言性(predictability)
情况肯定会是这样
There is someone coming.
It will be Mary.
should／ought to
责任和义务(obligation)应该
You ought to／should practice for more than an hour.
应该是(logical necessity)
Tom should know the address.
Let’s not go shopping now. The shops will be very crowded.
(这里不能用should)
Let’s go shopping now. The shops will/should be fairly empty.
Could you please give me your reply as soon as possible?
2.许可(permission)Can/Could I smoke here?Yes, you can.
3.can’t help doing禁不住，受不住(bear,stand)
I can’t stand waiting any longer
I wonder if I might have more salad. (委婉用法)
Yes, of course you may.
Studentsmay notstay out of the dormitory after midnight without written permission.
4.can’t help but do只能I can’t help but wait.
可能(possibility)
事物实际发生的可能性
Can/Could the news be true?
多用否定
It can’t /couldn’t be true.
may／might
许可(permission)可以
You must be mad to do that.
You must have difficulty getting the tickets.
You can’t have any difficulty getting the tickets.
(这里也可以用ought to)
must
责任和义务(obligation)必须
You must be back by ten o’clock.
Must you leave so soon?
No, I needn’t.
一定,肯定(logical necessity)
极大的可能性（只能肯定，否定为can’t）
情态动词
非推测性用法
推测性用法
can／could
1.能力(ability)能
He can speak English and Japanese.
He could explain what had happened. (他能做出解释，但可能没有说。)
He was able to explain what had happened.
可能(possibility)
可能性大may，小might
Tom may lend you the bike. (可能性大= It is very likely that...)
Tom might lend you the bike.(可能性小= I think it is unlikely.)
will／would
意愿(volition)
1.人作主语表愿意
Will you go with us?
Would you let mห้องสมุดไป่ตู้ hear from you soon?Yes, I will.
2.物作主语表性能、能力
Oil will float on water.The door won’t open.
预言性(predictability)
情况肯定会是这样
There is someone coming.
It will be Mary.
should／ought to
责任和义务(obligation)应该
You ought to／should practice for more than an hour.
应该是(logical necessity)
Tom should know the address.
Let’s not go shopping now. The shops will be very crowded.
(这里不能用should)
Let’s go shopping now. The shops will/should be fairly empty.
Could you please give me your reply as soon as possible?
2.许可(permission)Can/Could I smoke here?Yes, you can.
3.can’t help doing禁不住，受不住(bear,stand)
I can’t stand waiting any longer