why not 同义词是 why don't you 还是 why don't you do

why not 同义词是 why don't you 还是 why don't you do why don't we =why not 还是why don't you=why not Why don't you+...why not +. why don't you do=why not doing why don't you do why don't you still come 还是why do you still not come? why don't you why not后加do还是to do?why don‘t you 后面呢? 1.What do you not like?还是What don't you like?Why do you not 为什么是 Why don,t you like koalas 不是 Why do you don,t like koal 问一首歌.why don't you do so why not可以=why don't you