英语have to和must的区别

问题描述:

英语have to和must的区别

must表示主观,have to表示客观.
We must help each other.
My sister is ill, my mother has to look after her.
must的用法
1)表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须……,得……,要……”;由must引起的疑问句,肯定回答要用must或have to,否定回答要用needn’t或don't have to,意思是“不必”;must的否定形式mustn't表示禁止,意思是“不能,不许”.
We must find a good method to learn computer well.
我们必须找一个学好电脑的方法.
2)表示肯定的猜测,常用于肯定句中,意思为“一定是,必然……”.
注意must表示推断或猜测的几种情况:
Your sister must be a doctor in this hospital.(现在的猜测)
你姐姐一定是这家医院的医生.
have to/have got to的用法
1)must表示一种主观的需要,而have to表示一种客观的需要,意思是“不得不”.如:
I have to attend an important meeting this afternoon.
今天下午我不得不参加一个重要的会议.
Mother is out,so I have to look after the shop.
妈妈不在家,因此我不得不照看商店.
2)have to的否定形式是don’t have to,相当于needn’t.如:
They don’t have to buy a computer at present.
他们目前没有必要买电脑.
3)have to与have got to常可以互换.
have to有人称、数、时态的变化,而must只有一种形式.但must 可用于间接引语中表示过去的必要或义务.
He had to look after his sister yesterday.
3) 在否定结构中: don't have to 表示"不必"
mustn't 表示"禁止",
You don't have to tell him about it. 你不一定要把此事告诉他.
You mustn't tell him about it. 你一定不要把这件事告诉他.
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