为什么不睡觉why not sleep?或是why don't go to sleep?表达都正确吗?

问题描述:

为什么不睡觉why not sleep?或是why don't go to sleep?表达都正确吗?
为什么还不睡觉,why not sleep?或是why don't go to sleep?
这两种方式表达都正确吗?
why not是什么用法呢?后加什么?why not 一般是表达建议的吧?
如果说why not go to sleep也对吧?

why not后面直接接动词原形,但why don't后面要有主语的,所以题目中why don't go to sleep是错误的,只能说why don't you go to sleep或why not (go to) sleep?