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must 和 have to详解和练习

初一知识点

Must 和 Have to

must (无词形变化)

(1)。表"必须","应该","务必" must not(mustn't)表"禁止","不许","不准","不可以"。 Everyone must attend the lecture. The work must be finished as soon as possible.

You mustn't lend it to others.

注;对must问句的回答。 -Must I go there now?

-Yes, you must.

-No ,you ①needn't. ②need not ③don't have(got) to ④don't need to.

2.must表推测"一定","必定",一般只用于肯定句,亦即用于疑问句和否定不表揣测。

(1)对现在He must be at home now. You must be hungry after the long walk.

The Chinese language must have the largest number of speakers.

(2)对进行时。 He must be sleeping now(at that time).

(3)对过去时或完成时。

It must have rained last night. He must have fallen asleep(then).

He must have gone to Beijing yesterday. She must have been young when she got married . 注意其反意问句。

3 .must表不可避免的倾向。 All men must die.

4 . must 表"偏偏","不巧" My car must break down.我的车偏偏坏了。

have to "不得不"

1. 与must的区别 (1)must表说话人的主观看法,而have to表客观需要。

比较:I have to stop smoking .(外界压力,客观情况使然)

I must stop smoking.(主观认为)

2.must只有一种形式而have to有更多的形式have to, has to ,had to ,will have to 等等。 I thought I must go there.

3.have to 的疑问,否定均须借助于do。 Does he have to go there now ?

不说Has he to go there now?

He has to go there now, doesn’t he? The work has to be finished before 10 o'clock..

4.must与had to的差别: had to还可以表示业已完成或实现的动作(即;动作确实做了)。 I had to stay at home last night.

Can

1.表"能力"I can lift the stone. I can speak English while he can't. Who can play the violin? He got up early yesterday so that he could catch the early bus.

could 表过去的能力。

注;1。can 与be able to表能力时的区别:

① 形式上;can有两种形式can 与could,而be able to有更多的形式。

is(are)able to, was able to ,, has been able , will be able to , would be able to 等。

be able to 只表能力而can 还可表"可能性","惊异","许可"等。

② could与was able to表过去能力的差别:均表过去的能力,但was(were)able to还可表业已成功的行为(即:动作确实做了)。

2.表"许可"You can go now. You can use my dictionary. You can have a rest.

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