who - 在陳述句中怎麼用

who 在陳述句中就已經不是疑問詞了，而是變成了引導詞，引導各種從句。

Who you are is very important to us. 主語從句

I don't care who you are. 賓語從句

The important thing is who you are talking to just now. 表語從句

A teacher is a person who teaches knowledge to us. 定語從句

在主謂賓結構，who開頭的陳述句做賓語，而who 是陳述句的主語。如：Nobody knows who eats the apple.