haven't和 didn't的区别小弟才疏学浅 总是搞不清haven't和 didn't的区别（没能深入了解）

haven't和 didn't的区别小弟才疏学浅 总是搞不清haven't和 didn't的区别（没能深入了解） I haven‘t do 和I didn’t do 的区别.比如说，I didn‘t decide和I haven’t decided。 if i didn't met you和if i haven't met you 的区别是? 请问I didn't see him和I haven't see him的区别 didn't know,had't know和haven 't know用法有什么区别 didn't和haven't什么有区别还有hadn't didn't 和couldn't的区别, hasn't got 和haven't got的区别 don't doesn't didn't won't hasn't haven't hadn't 的用法 haven't been to.和haven't gone to 的区别 can’t 和 won’t didn’t doesn’t 的区别是啥can’t 和 won’t didn’t doesn’t 的区别是啥 hadn't 和 didn't have的区别RT 请问did,didn't和have,haven't有什么区别吗?它们都是代表过去的,比如I didn't finish my work yesterday和I haven't finish my work yesterday都是代表我昨天没有完成工作,但是有什么区别呢?这两个词的用法有什么 without 与haven't的区别 这两句有什么区别?Didn't you teach English?Haven’t you teach English? i don t know和I didn't know的区别什么时候用don't,什么时候用didn't 过去时和现在完成时到底什么区别啊?请举例,（就是类似i haven't 和i didn't 是什么区别,什么时候用哪个）. haven't 和 don't have 有什么区别么