If you are tired,why not ______(have)a rest?

If you are tired,why not ______(have)a rest?
If you are tired,why not ______(have)a rest?

If you are tired,why not ______(have)a rest?
having

have
why not do sth=Why don't you do sth 为什么不做某事
希望帮到你

have,why not do=why do not you do something

have. why not do sth.?=why don't you do sth.?