What do you do?为什么要有两个do,

What do you do?为什么要有两个do, What do you do ()the evening?为什么 what do you do? “what do you do! What do you do? what do you do what do you do 和 how do you do,要有根据的,有什么区别 , 和do有关的语法问题what color do you like为什么要有do,和do有关的语法问题what color do you like这句话中为什么有do? what work do you do 和what do you do 一样吗 为什么 这里为什么要有do呢?How do you know? What do you do at what do you do after what do you do ( ) christmas? what do you do every What do you do every What do you do是什么意思 What chores do you do what do you do on