I spent the whole day in my room,but I did not write a single card!

题目

I spent the whole day in my room,but I did not write a single card!
write为什么不用过去式?

答案

因为句子当中有did,已经是被动时态了,所以write就可以不用过去式了,如果还是不明白的话,可以去小马过河问问那里专业的英语老师,希望他们能给你满意的解释.