who are you?是基本的书面用语,语法\句式各处都很完整规范.书面的\官方的\平淡的问句.who you are.则一般常见口语中.其实这是一个相当简写的从句.例如:I don't know who you are.我不晓得你是谁.因为口语化的句子用...