i didn't understand 与 i don't understand的区别?

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i didn't understand 与 i don't understand的区别?
我知道时态不同,但我在对话时看到DIDN'T,一个人没听懂另一个人说什么,然后请他重复一遍,用的是：i didn't understand you,can you repeat that please?
我原来都用DON'T,有些不是很明白

我觉得你应该是听错了,不会有这样的回答
用didn't表明过去不知道但是现在已经知道,用don't表明现在还不知道,所以才会问can you repeat that please,
但是如果整个对话是发生在过去,那么都要用过去时could you repeat,但是意思仍然是在对话时不懂

i didn't understand 与 i don't understand的区别? I didn't understand和I don't understand有什么区别 i don't understand I didn't understand ________________ Sorry,I don't understand . afraid i don't understand I don't understand you. I still don't understand 是I can't understand 还是I don't understand? He said something () i didn't understand. I can't understand.I don't understand.I'm not understand,这三个 u don;t understand what i said