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Chapter 11、 may/can

permission

posibility

may: 用于长辈与晚辈之间，上下级之间，不是很的熟

could: 客气的

can: 非常熟，同辈之间，很随便的

1. permission

asking for permission:

Could I use your bike?

Of course, you can.（如用could回答,意为“你用吧”，有犹豫的不想借之意） 转达用can,不能用may

It’s not fair, Mary can stay up till ten and I have to go to bed at eight.

2. posibility

Will you answer the phone?

a.

It may be your mother.

According to the radio it may rain this evening.

Guangzhou can be very hot in summer.

Mr. Smith looks pale. He may be ill.

Mr. Smith is in poor health. He can be ill at any time.

Where is John?

He may be in the library.

Other modal verbs for deduction:

He must/will/would/ought to/should/could/may/might be in the library.

b.

He may ’not go tomorrow. (= I do not permit him to go)

He ’may not go tomorrow.(= It is possible that he will not go)

Interrogative: 疑问句用can和could

( It is midnight, there is a knock at the door)

Who can/could that be, so late?

It may/…(就是不能用can，其他都可用) be Tom, without bringing the key againg. Negation: could’t（不大可能）

It may not be Tom. （may not可能不）

It can’t be Tom. He has gone to Beijing.（can’t不可能，）

3. ability（其中有现在，将来，过去的ability）

1) present and future ability: can/be able to present and future

a. present ability

Can you/Are you able to type?（用Can you意为“懂的”，用Are you able to意为“不是很懂”） b. future ability（纯粹能力）

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