don't not isn't

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don't not isn't
请问什么时候用don't 什么时候用not 什么时候用isn't
请说明一下遇见什么什么词性的词分别用以上3种形式,比如我知道遇见名词的时候之前放BE动词,那么遇见什么词性的单词会用以上3种形式呢?
为什么说somking isn't allowed.而不是somking don't allowed.

e not是系动词的否定,用于主系表结构,后面接形容词或者名词；
do not是动词的否定,用于主谓宾结构,后面接动词原型；或者疑问句,
比如：Don't you think so?
not````是不想缩写了就写出来的
smoking那个嘛`这个是被动语态,吸烟是被禁止而不是主动禁止,其实是smoking isn't allowed by sb`,省略后面的,翻译是禁止吸烟.
被动语态和这些情况差不多,就是强调一个“被”字,基本结构式be done.

don't not isn't 用am not,aren't,isn't,can't,don't,doesn't填空 am not, aren't, isn't, can't, don't doesn't 用am not.aren't.isn't.don't.doesn't.来完成句子. ______ go .A Not B Don't C Doesn't D Isn't Kate___on line. A.not go B.don't go C.doesn't D.isn't go 英语翻译am not aren`t isn`t can`t don`t doesn`t 这些词要怎么运用 don't和isn't的用法? Don't ,isn't有什么区别 isn't=is not There isn't not much difference between the two.I don't know isn't aren't don't doesn't的区别!