我是一名英语老师,希望我的回答可以帮到你：Who are you?是一个特殊疑问句,意思是“你是谁?” who you are是陈述句,常用作从句作某一陈分,如I don't know(who you are)?此时who you are作know的宾语,这个是一个宾语从句.