did you understand 和 do you understand 的用法区别

题目

did you understand 和 do you understand 的用法区别

答案

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.