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Don thAvEto的意思

needn'thaveto是本不必做而做了,是虚拟语句don'thaveto是没必要去做某事

不是一定要have to have to通常指由于客观原因则不得不做某事,意思为“不得不”.e.g.It's dark now.I have to go home.天黑了,我不得不回家.It's raining,and I have to stay at home.外面在下雨,我不得不呆在家里.

don't have to 其实为 (do) not have to 不必 不需其意义等同于: do not need to 这里面 need 是实义动词 前否 用 don't

mustn't是“禁止”的意思,凡用此的后面一定跟绝对不能或绝对不允许做的事.don't have to,doesn't have to,didn't have to三个都是 “没有必要做” 的意思只是在时间和对象的使用上有区分;don't have to用于一般现在时的复数或对本人的叙述上,doesn't have to用于一般现在时的单数人称,而didn't have to则用于过去时中(此时

一样,不需要.needn't用在否定回答.don't have to用途广泛.

must强调主语的主观的"必须" 比如"i must go now for i am hungry"这里在客观上他并不一定要走,但是由于他饿了,他自己觉得必须走了,所以是must 另外must可以用做命令."you must go now!"而have to则不行 must还可以在肯定句中

当然不用worried about ,直接说 Don't worry.就可以了.可译为:不用担心.

1 You don't have to tell him this matter.2 You had better not to stay up.3 When watching movies,you must keep quiet.4 Why don't you share your joy of success with your mother

must

您好!三者后面都接动词原形.don't have to = needn't 不必 ,mustn't + do ,表示禁止,不允许.didn't + do ,表示行为动词的过去时. 望采纳!谢谢!

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