语四六级考试语法备考指导：定语从句

The novel which mainly discusses the development of Chinese economy was given by the professor.
The novel mainly discussing the development of Chinese economy was given by the professor.
SP: (1) why的先行词reason或可用that 指代的名词也是定语从句的原因状语时，例如：
1. That is the reason (for which/why) you dislike it.
2. I wonder the reason (why/for which) he changed his mind.
(2) 表示方式的先行词way，其后的关系代词可用that，也可省略，例如：
1. Everyone does not like the way (that) he talks.
2. Do you know the way (that) the teacher treated his students.