did you understand 和 do you understand 的用法区别

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did you understand 和 do you understand 的用法区别
did you understand 和 do you understand 的用法区别

did you understand 和 do you understand 的用法区别
did 是过去时态,用于过去.比如说,你上课走神了,下课之后,老师问刚刚上课听懂了没,就是did you understand.
do是一般现在时,用于当前状态.比如说,老师刚讲完一个知识点,马上就问学生听懂了没,就是do you understand.

一般使用:understood?

did you understand 你是否早就知道?
do you understand 你是否现在明白?

一个是过去知道么,一个是知道么