Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't请说说musn't与can't的区别和用法

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Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't请说说musn't与can't的区别和用法
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Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't请说说musn't与can't的区别和用法
Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't
请说说musn't与can't的区别和用法

Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't请说说musn't与can't的区别和用法
用MUSTN'T的时候,是表示已经肯定了某事,这道题应该要选A的,因为后面那句话已经说了海伦已经去北京.
而如果用CAN'T的话,有带有可能,猜测的意思,带有不确定因素.

musn't表示禁止
can't表否定推测,表示没有能力

一,cannot或can't
表示"不能够""不可以"和"不可能".如:
1.I cannot answer your question at present.我目前无法回答你的问题.
2.—Can I leave now 我可以走了吗
—No, I am afraid you can't.对不起,恐怕不行.
另外,cannot还用于固定习语中.如...

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一,cannot或can't
表示"不能够""不可以"和"不可能".如:
1.I cannot answer your question at present.我目前无法回答你的问题.
2.—Can I leave now 我可以走了吗
—No, I am afraid you can't.对不起,恐怕不行.
另外,cannot还用于固定习语中.如:
She cannot help laughing. 她禁不住笑了.
I cannot but try again. 我不得不再试一次.
You cannot be too careful. 你越小心越好.
二,may not
表示"不可以""不可能".如:
1.—May I turn the radio on 我可以打开收音机吗
—No, you may not.不,不可以.
2.She is busy these days. She may not go to the concert tonight. 近来她很忙,今晚她可能不来听音乐会了.
三,must not或mustn't
表示" 不应该""不可以"和"禁止".如:
1.—May I take this book out of the reading room 我可以把这本书拿出阅览室吗
—No, you mustn't. 不,不可以.
2.—Can I park my car here 我可以在这儿停车吗
—No, cars mustn't be parked here.不行,这里禁止停车.
四,need not或 needn't
表示"不必".如:
—Must I finish the work at once 我必须马上完成这工作吗
—No, you needn't(don't have to).不,你不必.

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