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must用法详解

2020-06-04来源:和谐英语

 

四、表示偏偏

有时表示不巧,有时表示固执,通常都是指令人不快的事:

Must you make so much noise? 你就非得弄出这么大的声音吗?

Why must you always interrupt me? 你为什么硬是老要打断我?

We were ready to leave, but the baby must catch cold. 我们刚准备好要走, 可孩子偏偏得了感冒。

Just when I was busy, the neighbor must come and chatter. 正当我忙碌的时候,邻居偏偏过来聊天。

 

五、must 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) 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。(他可能知道了)