why did he not have breakfast?与why didn’t he have breakfast?有什么区别吗

问题描述:

why did he not have breakfast?与why didn’t he have breakfast?有什么区别吗

前面一个句子一般是不怎么说的 问句中 did 和not 需要合并在一起

语法上没有差别,但习惯上更应倾向于使用后者.