used to的反意疑问句,否定句,一般疑问句是什么

问题描述:

used to的反意疑问句,否定句,一般疑问句是什么

举个例子He used to read books at night.He didn't use to read books at night.Did he use to read books at night?He used to read books at night,didn't he?明白了吧