为什么Why don't you不能写成Why do not you?

问题描述:

为什么Why don't you不能写成Why do not you?
Why isn't he 又为什么不能写成Why is not he?

因为这里的don't不等于do not,不是不要的意思.
why don't you的意思是 你为什么不..
同 why do you not
要这样写:why do you not...和 why is he not