It is you who are next 为什么第一个要用is 而不是are

It is you who are next 为什么第一个要用is 而不是are 为什么用who is it 而不用who are you? 老外问你是谁是不是说who is it?而不是who are you? who sits next to you nobody___ do are is does 选哪个,为什么?答案不是is It is not who you are who sits next to you nobody___ do are is does 选哪个,为什么? 【ENGLISH】为什么是“who are you”而不是“whom are you?” 在Who are you?中问什么用are而不是IS It is who you are,not where you are from or what you have＿（m 为什么What are you doing ,Li Yan?"you"前是“are” 而不是“is” it is you who are a smart girl这句话对吗it is you who is a smart 为什么要用is而不是are?