you did that when这个是这句话的原来位置
转换成问句 be动词或助动词要提前
所以用did you do
did就是do 的助动词形式
比如：i had lunch at 8 o'clock
转换：did you have lunch at .
when did you do that 中do 为什么用原形不用过去式?
6个回答
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