why don't与why not的区别

Why don\'t 后加一个句子（e.gWhy don\'t 〖we go to the movies〗)
Why not+ do sth.

没区别吧!好像是通用的呀!

Why don\'t 后加一个句子（e.gWhy don\'t 〖we go to the movies〗)
Why not+ do sth.

why donnot后要加sb. do sth.(Why donnot you/we/they…………go out for a walk?)

why not直接加do sth.(Why not go for a walk?)