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在初中阶段，定语从句是英语语法中非常重要的部分。它可以为我们的句子提供更多的信息，使其更加丰富和有意义。下面是初中定语从句用法的归纳总结：
什么是定语从句？
定语从句是一种修饰名词或代词的从句，用来说明或限定这个名词或代词的含义。定语从句可以出现在名词前或者后面，用来进一步说明这个名词的特征，性质或者状态。
定语从句的构成
定语从句由关系词和从句两部分构成。关系词在从句中充当连接词的作用，引导从句与主句之间的关系。常见的关系词有：who, whom, whose, which, that等。
定语从句的构成如下：
[主句] + [关系词] + [从句]
例如：
- The book [that] I bought yesterday is very interesting.
- The girl [who] is standing there is my sister.
定语从句的用法
- 用来修饰人或物，进一步说明其特征和性质。
例如：
- The teacher [who] is teaching us English is very strict.
- The car [that] I saw yesterday is very expensive.
- 用来限定名词或代词的范围或者具体对象。
例如：
- The girl [whom] I met yesterday is my classmate.
- The book [which] is on the table is mine.
- 用来替代主句中的名词或代词，使句子更加简洁。
例如：
- The boy [who] is wearing a red shirt is my friend. → The boy [wearing a red shirt] is my friend.
- The book [that] I am reading is very interesting. → The book [I am reading] is very interesting.
定语从句的注意事项
- 当关系词指代人时，可以用who, whom, whose等，其中whose表示所有格。
例如：
- The man [who] I met yesterday is very kind.
- The girl [whose] bag was stolen is crying.
- 当关系词指代物时，可以用which, that等。
例如：
- The book [that] I borrowed from the library is very helpful.
- The pen [which] I lost yesterday was very expensive.
- 当关系词在从句中作主语时，可以省略。
例如：
- The boy [who] is standing there is my brother. → The boy standing there is my brother.
以上是初中定语从句用法的归纳总结，希望对学习英语的同学有所帮助。
