语法专题：定语从句基本概念：定语从句：在主从复合句中像形容词一样起修饰或限定作用的句子。Eg: Students who are interested in English may attend the lecture. 先行词：被定语从句修饰的是先行词。先行词可以是一个词、短语、或是整个句子。 John passed the exam, which made his parents happy.Students who are interested in English may attend the lecture.关系词： 引导定语从句的词是关系词。分为关系代词和关系副词。定语从句的种类： 1. 限制性定语从句：通常与主句紧密相连，译为“的”如果去掉整个句子所表达的意思就不完整了。Eg: This is the book that I want to read. 2. 非限制性定语从句：在结构上通常与主句用逗号隔开，如果去掉的话不影响主句的意思。Eg: The book, wh
