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.

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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