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定语从句是英语语法中比较复杂的一种语句结构，但它在英语表达中的作用十分重要。定语从句指的是在一个主句中作为定语的从句，它通常用来修饰名词或代词，以增加句子的信息量和表达的准确度。定语从句的划分方法有以下几种：
1. 关系代词
定语从句中最常用的引导词是关系代词，包括that, who, whom, whose, which等。关系代词通常用来引导修饰人或物的定语从句，例如：
- The book that I borrowed from the library is very interesting.
- The girl who is singing on the stage is my sister.
- The car which is parked outside belongs to my neighbor.
2. 关系副词
除了关系代词，定语从句中还可以使用关系副词，包括where, when, why等。关系副词通常用来引导修饰地点、时间或原因的定语从句，例如：
- This is the city where I was born.
- Do you remember the day when we first met?
- The reason why he didn't come to the party is unknown.
3. 不定式
有些时候，定语从句也可以使用不定式来引导，通常用于修饰表示人的名词，例如：
- She is the first person to arrive at the meeting.
- The man to whom I sold the car is very satisfied with it.
4. 倒装结构
在定语从句中，介词+关系代词/关系副词的结构通常要进行倒装，即将介词提前，例如：
- This is the house in which I used to live.
- The reason for which he was late is unclear.
以上是定语从句的划分方法，掌握这些方法可以帮助我们更好地理解和使用定语从句，提高英语表达的准确性和流利度。
