why do not you =why not ______

why do not you =why not ______ why don't you do=why not doing Why do you do not understand why My heart ache why not do还是why not doing? why not do it why not do sth why not +do sth Why do not want why not do句子 i do not why you think so? Why do not you surf the Internet? why do not you…和why do you not…,why aren't you able to…和why