must 与 have to 的区别1.

强调重点不同两者都表示“必须”，但 must 侧重于说话者的主观看法，认为有必要或有义务去做某事；have to则重于客观需要，含有“不得不”或“被迫”之意：



We must go at once.

我们必须马上就走。

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must 只有现在时一种形式(在宾语从句中可以表示过去)，而 have to则有多种时态形式：He said (that) she must go with me.

他说她必须同我一起去。

She had to go there on foot yesterday.

昨天她不得不步行去那儿。

They have had to buy a car.

他们不得不买了辆小汽车。

3.

语法功能不同have to可以有分词、动名词、不定式等形式，而must则没有这些形式：He only saw her in the evening, having to be away all day.

他整天得外出，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“一定不要”、“不允许”；而 have to 的否定式 don't have to 意为“不必”(=needn't)。

比较：You mustn't tell him about it．你一定不要告诉他这件事。

(这可能是秘密) You needn't tell him about it．你不必告诉他这件事。

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