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must与have to的用法

作者: admin来源: 网络文章 时间: 2017-02-14

(1) must表示主观义务,意思是“应该,必须”,其否定式mustn't意为“不应该,不准”。如:

We must get there before five o'clock. 我们必须在五点钟前赶到那儿。

You mustn't break the rules. 你不要破坏规定。

对用must所提问题的否定回答,常用needn't或don't have to,意思为:不必。如:

Must I stay here after school? 放学后我还得留在这儿吗?

No, you needn't / don't have to. 不了,没有必要。

2. must表示推测,意思为:一定,必定(只用于肯定句中) 。如:

He must be our headmaster. 他肯定是我们的校长。

He must have seen the film last night. 他昨天晚上肯定看了那场电影。

3. have to表示客观要求,意思为:不得不;必须;除此之外,别无选择。如:

Now there's no bus here, so we had to walk home. 现在这里没有汽车了,我们只好走路回家了。

We have no food home, you have to go and get some, Tom. 家里没有食物了,汤姆你得去买一些来。

4. have to可以用于多种时态;而must只用于一般现在或将来。如:

The composition is due to hand in this morning, so I had to finish it last night. 作文今天早晨到期,因此我不得不昨天晚上完成。

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