Pain is the feeling of unhappiness that you have.定语从句的先行词是什么?that you have 修饰【the feeling of unhappiness】还是【unhappiness】the feeling of unhappiness 这里是同位语对吧?
The Tang Dynasty,which lasted from 618 through 907,was the most splendid period of the chinese history .(ps: which这里是定语从句,这个我知道,但是逗号后面的那句,was the most.......这个是同位语吗?定语从句能做同位语成分吗?谢谢!