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定语从句是英语中比较复杂的语法结构之一,但在写作中经常会用到。定语从句用来修饰名词或代词,使句子更加丰富多彩。要正确地使用定语从句,需要掌握以下几点:
1. 引导词
定语从句必须有一个引导词,常用的引导词有:who, whom, whose, which, that。其中,who和whom用于人,whose表示所有格,which和that用于物或事情。
2. 位置
定语从句通常紧跟在被修饰的名词或代词后面,如:
- The man who is sitting over there is my uncle.
- The book that I borrowed from the library is very interesting.
但也可以把定语从句放在句子的开头或结尾,如:
- Who stole my wallet remains a mystery.
- This is a very interesting book, which I highly recommend.
3. 逗号
如果定语从句是必需的,就不需要在引导词后添加逗号;如果定语从句只是补充说明,就需要在引导词后面添加逗号,如:
- The man, who is sitting over there, is my uncle. (只是补充说明)
- The man **who is sitting over