该选must还是have to

发布时间:2022-04-25T18:59:57 英语语法

该选must还是have to

请看这道题,选must还是have to:

I haven’t got enough money to buy a ticket,so I __________ go home on foot.

A. must                         B. have to                        C. ought to                         D. may

此题应选B。从句意上看,只能选A,B。关于must 和have to 表示“必须”时的区别,注意以下几点:

1. 强调重点不同:must强调主观; 而have to强调客观:

You must go now. (I want you to go now). 你必须现在就走(有“我要你现在走”之意)。

If I buy that car,I’ll have to borrow some money. 如果我要买那辆汽车,我得借些钱。

2. 时态形式不同:一般说来,must 只有现在时一种形式(在宾语从句中可表示过去),而have to则有多种时态形式:

He said (that) she must go with me. 他说她一定要同我一起去。

She had to go there on foot yesterday. 昨天她不得不步行去那儿。

He has had to buy a car. 他不得不买了辆小汽车。

3. have to可以有分词、动名词、不定式等非谓语形式,而must则没有这些形式:

He only saw her in the evening,having to be away all day. 他因整天得外出,所以只能晚上见她。

I regret to have to trouble you again. 我很抱歉不得不再麻烦你一次。

4. 否定式的意义不同:must 的否定式mustn’t意为“不准”、“不允许”;而 have to的否定式 don’t have to意为“不必”(=needn’t)。