译林2003课标版《Grammar and usage(2)： Modal verbs： comparisons》精品PPT课件优质课下载

译林2003课标版《Grammar and usage(2)： Modal verbs： comparisons》精品PPT课件优质课下载

Are there any changes in person and number of modal verbs?

Supplement: 1. used with infinitive( without to, except ought to)

2. “Have to”, as a sort of modal verb, has changes in person and number.

Group One is responsible for Can / May.

Group Two is responsible for Must .

Group Three is responsible for Should/ Shall.

Group Four is responsible for will/ would.

The smart boy can/ could solve the difficult math problem.

You can use my dictionary, if you want./ -- Can I sit here?—Yep, you can(No, you can’t)

Can it be I, not he, who is to blame?/--There is the doorbell.—Who can it be at this time of day?

Though she is an experienced HR, but she can make mistakes.

Supplement: could 用在疑问句中表示请求，语气比较婉转，但是肯定回答时要用can。

有能力或能够做某事：能，会

允许或请求允许（疑问句）：可以

疑问句中，表示怀疑/惊讶：难道，究竟/到底

有时的行为或情况：有时会

He may be right, so trust him./ What he did might well be reasonable.

You may sit down./ --May I go with Lucy to the park?—Yes, you may.

May you have wonderful vacation!

可能性：也许，可能

允许或请求允许（疑问句）：可以

表祝愿

(1) All passengers must fasten seat belts.

(2) You mustn’t speak to your mother in this way.

2. Why must you be so stubborn?