初中英语 九年级情态动词专题复习讲义

情态动词的用法

一．定义：

情态动词主要用于表示说话人的态度和看法。情态动词不能单独使用必须与动词原形一起构成谓语，其否定式是在情态动词后加否定词not 。一般疑问句则将情态动词提至句首。

二、基本形式：

三、基本用法

1. can 的用法 1)表能力

can 表能力时意味着凭体力或脑力或技术等可以无甚阻力地去做某事。 I can climb this pole. 我能爬这根杆子。

肯定式 否定式 简略否定式

may might may not might not mayn’t mightn’t can could can not could not can’t

couldn’t will, ’ll would, ’d will not, ’ll not would not, ’d not won’t wouldn’t shall should shall not should not shan’t shouldn’t must must not mustn’t need need not needn’t ought to

ought not to

oughtn’t to

8. shall的用法

意思为“将要/应该”

1)用于第一人称征求对方的意见，如：

What shall I wear on the journey? 我路上穿什么好呢？

Shall we dance? 我们跳舞好吗？

9. 情态动词will和would的用法

will (would) 表决心、愿望。would 为will 的过去式, 可用于各人称。

I'll do my best to catch up with them.

I'll never do it again, that's the last time.

He said he would help me.

注意：will, would用于第二人称疑问句表示说话人向对方提出请求或询问,用would 比will 更婉转,客气。

10. may be与maybe

二者都有“或许，也许”的意思，但用法不同：

(1). may be是情态动词，只能用于句子中，

如：It’s eight o’clock now. My father may be at home.

(2). maybe是副词，相当于perhaps, probably, likely，常用于句首。

如：It’s eight o’clock now. Maybe my father is at home.

11.had better 最好...

had better do sth. / had better not do sth. (重点)

You had better keep silent in class.

四、易错点：

(一)、can, may, must , need, should的提问与应答：

(1). Can I go to the cinema tonight?

Yes, you can./No, you can’t.

(2). May I have a look at your photos?

Yes, you may / can./No, you mustn’t / can’t.

(3). Must I book a ticket for the concert right now?

Yes, you must./No, you needn’t / don’t have to.

(4). Need I water the flowers in the garden in the afternoon?

Yes, you need / must./No, you mustn’t.

(二)、表示判断: may / may not, must ( be ) / can’t ( be )

(1). 判断语气坚定，有理有据（常摆出理由）

①. 肯定判断（must ）

e.g. The light in the office is on. Our teacher must be still working.

It must have rained last night, for the ground is wet and muddy.

①. 否定判断（can’t / can not）注：不能用must not 或mustn’t 形式

e.g. Mr. Green can’t be at home, for I met him at the street just now.

This book can’t be Betty’s. She doesn’t like detective stories.

(2). 判断语气不坚定，模棱两可，不确定，常附带有I’m not sure / I don’t know等句子。

e.g. —How soon will your father come back home from London?

—May be in a week, but I’m quite not sure.

I.Choose the best answer.选择填空。

1.Tom gets up early every day except Saturday or Sunday, because he ________ go to school.

A. mustn’t

B. needn’t

C. shouldn’t

D. can’t

2.Thanks to the first development of communication technology, people in China ____ make phone calls

anywhere at any time.

Grammar--modal verb