didn't和haven't什么有区别还有hadn't

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didn''t和haven''t什么有区别还有hadn''tdidn''t和haven''t什么有区别还有hadn''tdidn''t和haven''t什么有区别还有hadn''tdidn''t是不,过去式haven''t

didn't和haven't什么有区别还有hadn't
didn't和haven't什么有区别
还有hadn't

didn't和haven't什么有区别还有hadn't
didn't是不,过去式
haven't是没有,一般现在式
hadn't也是没有,过去式