why not do和why not to do有什么区别?要尽快!

why not do和why not to do有什么区别?要尽快! Why not do 和 Why don't do 什么区别 why do not和why not有什么不同? Why don't do sth和 why not do sth有什么区别? why do not do sth与why not do sth有什么区别? why not doing和why not do到底哪个是对的,如果都对有什么区别 why not +什么 doing?do? why not do等于什么 why do not you…和why do you not…,why aren't you able to…和why why not sb +do还是to do why not to do 还是why not doing why not doing sth还是why not do sth还是why not to do sth