mustn't can't needn't 的区别
mustn't、can't、needn't的区别为:释义不同、侧重不同、语气不同。
一、释义不同
1、mustn't:mustn't的释义为禁止、不可以。
2、can't:can't的释义为不能、不可能。
3、needn't:needn't的释义为不需要、不必。
二、侧重不同
1、mustn't:mustn't侧重于行为。
2、can't:can't侧重于能力和推测。
3、needn't:needn't侧重于事件。
三、语气不同
1、mustn't:mustn't的语气最强烈,He mustn't be there yesterday.他昨天肯定不在那儿。
2、can't:can't的语气最缓和,为 I can't get it.我够不到它。
3、needn't:needn't的语气较强烈,You needn't come tomorrow.明天你不必来。
首先都是情态动词,所以后面都跟动词原形。
意思不一样。 不应该/ 不能(一定不)/ 不必, 例如:
You mustn't blame her so hard this time.
He can't be my father because he has gone to America.
I needn't tell you the obvious truth, you can figure it out by yourself sooner or later.