【初中定语从句的专项练习】在初中英语学习中，定语从句是一个重要的语法知识点，也是考试中常见的考点之一。掌握好定语从句的用法，不仅有助于提高阅读理解能力，还能增强写作表达的准确性与丰富性。
定语从句的作用是修饰名词或代词，相当于一个形容词的功能。它通常由关系代词（如 who, whom, whose, which, that）或关系副词（如 when, where, why）引导。在句子中，定语从句紧跟在被修饰的词之后，起到补充说明的作用。
例如：
The girl who is wearing a red dress is my sister.
（那个穿红裙子的女孩是我的姐姐。）
在这个句子中，“who is wearing a red dress”就是定语从句，用来修饰“the girl”。
在初中阶段，常见的定语从句结构包括：
1. that / which 引导的定语从句
用于修饰物，可以指人或事物。
例句：The book that I bought yesterday is very interesting.
2. who / whom 引导的定语从句
用于修饰人，who 作主语，whom 作宾语。
例句：The man who is talking to the teacher is my father.
3. whose 引导的定语从句
表示所属关系，既可指人也可指物。
例句：The student whose homework is not finished will be punished.
4. where / when / why 引导的定语从句
用于表示地点、时间或原因。
例句：This is the place where we met for the first time.
为了帮助同学们更好地掌握定语从句，下面是一些典型的练习题：
一、选择正确的引导词填空：
1. The man ______ is standing over there is my uncle.
A. who B. which C. whom D. where
2. This is the house ______ I was born.
A. where B. which C. that D. when
3. The girl ______ won the prize is my classmate.
A. who B. which C. whose D. when
4. Do you know the reason ______ he was late?
A. why B. where C. when D. which
5. The book ______ I borrowed from the library is very useful.
A. that B. which C. who D. whose
二、改写句子，将两个简单句合并为一个含有定语从句的复合句：
1. She is a teacher. She teaches English.
→ She is a teacher who teaches English.
2. The car is broken. It belongs to my brother.
→ The car that belongs to my brother is broken.
3. I saw a boy. He was playing football.
→ I saw a boy who was playing football.
4. This is the school. We studied there.
→ This is the school where we studied.
5. The girl is my friend. Her bag is blue.
→ The girl whose bag is blue is my friend.
三、判断下列句子是否正确，并改正错误：
1. This is the factory where we worked last year.
✅ 正确
2. The man whom I met yesterday is my teacher.
✅ 正确
3. That is the person which helped me.
❌ 错误，应改为：that is the person who helped me 或 that is the person which helped me（若指物则可用 which，但指人时更常用 who）
4. The girl who is sitting next to me is my sister.
✅ 正确
5. The book which I read is very interesting.
✅ 正确（也可以用 that）
通过反复练习和不断积累，同学们可以在实际应用中更加熟练地使用定语从句。建议多读一些含有定语从句的英文文章，培养语感，同时注意区分关系代词和关系副词的用法，避免混淆。
希望这篇练习能够帮助大家更好地理解和掌握初中阶段的定语从句知识！
