how to do 怎么做 what to do 做什么 when to do 什么时候做 who to do谁去做 why to do 为什么做 疑问词加动词不定式：a)构成：what,which,how ,when,where等疑问代词或疑问副词,后面几个一个动词不定式或动词不定...