you used to be short,didn't you?为什么用didn't you?

问题描述:

you used to be short,didn't you?为什么用didn't you?
you used to be short,didn't you?为什么用didn't you?不用are't you

前一句是过去常常...要根据前面来回答,前面没有be,所以后用didn't you 或useden't you 都行,但常用的是前者.书上也是.