英文mustn't,don't have to,doesn't have to,didn't have to有什么区别这几个词各自的意思是什么?我是在做练习时遇到这题目.要我选择哪一题用哪一个词.

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英文mustn't,don't have to,doesn't have to,didn't have to有什么区别这几个词各自的意思是什么?我是在做练习时遇到这题目.要我选择哪一题用哪一个词.
英文mustn't,don't have to,doesn't have to,didn't have to有什么区别
这几个词各自的意思是什么?
我是在做练习时遇到这题目.要我选择哪一题用哪一个词.

英文mustn't,don't have to,doesn't have to,didn't have to有什么区别这几个词各自的意思是什么?我是在做练习时遇到这题目.要我选择哪一题用哪一个词.
mustn't,比don't have to语气强烈,其他的就是时态和第几人称的问题

前两个意思接近 大多数情况下可以互换
后三个只是时态和人称的不同
分别为:第一二人称一般现在式,第三人称一般现在式,一般过去式

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...

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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(此时不用管单复数)。

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