定语从句怎样判断?

问题描述:

定语从句怎样判断?

看先行词
that引导的定语从句为例
当先行词为主句的表语或者关系代词为从句的表语时.
This is the book that was bought yesterday.这就是昨天买的书.最好看语法书 这里说的不全