定语从句是初中英语学习的重点和难点，它能使句子更加丰富、表达更加准确。本训练旨在帮助同学们系统复习和巩固定语从句的知识，提升解题能力。

一、定语从句基础知识回顾

定语从句是用一个句子来修饰名词或代词，这个句子被称为定语从句，被修饰的名词或代词称为先行词。定语从句通常位于先行词之后，由关系词引导，常见的关系词有关系代词(who, whom, which, that, whose)和关系副词(when, where, why)。

关系代词在定语从句中作主语、宾语、表语、定语等成分，关系副词在定语从句中作状语。关系词的选择要根据先行词的指代以及在从句中的作用来决定。

二、专项训练题

（一）单项选择题：

1. This is the book _______ I told you about yesterday.

A. who B. whom C. which D. whose

2. The man _______ is talking to the teacher is my father.

A. who B. whom C. which D. what

3. The factory _______ we visited last week is very modern.

A. when B. where C. which D. who

4. The reason _______ he was late is unknown.

A. when B. where C. why D. how

5. The girl _______ brother is a doctor is from Beijing.

A. who B. whom C. which D. whose

6. That is the restaurant _______ we had dinner last night.

A. which B. where C. what D. how

7. This is the picture _______ my mother took.

A. who B. whom C. which D. whose

8. The days _______ we spent together were wonderful.

A. when B. where C. why D. how

9. I know a boy ______ can speak three languages.

A. who B. whom C. which D. whose

10. Is this the house ______ you were born?

A. which B. where C. when D. why

(二) 用适当的关系词填空：

1. The film _______ we saw last night was very interesting.

2. The teacher _______ taught us English is very kind.

3. The city _______ I live in is very beautiful.

4. The reason _______ he didn't come is a secret.

5. The man _______ car was stolen called the police.

6. That is the place _______ the accident happened.

7. The book _______ you lent me is very useful.

8. He is the student _______ I admire most.

9. Do you know the girl _______ is wearing a red dress?

10. The time _______ we will meet is at 8:00 pm.

(三) 将下列句子合并成含有定语从句的句子：

1. This is the pen. I used it to write the letter.

2. The man is a doctor. He saved my life.

3. The park is beautiful. We often go there.

4. The book is very interesting. He gave it to me.

5. The woman is my teacher. Her son is a student.

三、参考答案及解析

(一) 单项选择题答案：

1. C (which: 指代先行词book，在定语从句中作介词about的宾语)

2. A (who: 指代先行词man，在定语从句中作主语)

3. C (which: 指代先行词factory，在定语从句中作宾语)

4. C (why: 引导定语从句，修饰reason，表示原因)

5. D (whose: 指代先行词girl，在定语从句中作定语，表示...的)

6. B (where: 指代先行词restaurant，在定语从句中作地点状语)

7. C (which: 指代先行词picture, 在定语从句中作宾语)

8. A (when: 指代先行词days, 在定语从句中作时间状语)

9. A (who: 指代先行词boy, 在定语从句中作主语)

10. B (where: 指代先行词house, 在定语从句中作地点状语)

(二) 填空题答案：

1. which/that

2. who/that

3. where

4. why

5. whose

6. where

7. which/that

8. whom/that

9. who

10. when

(三) 合并句子答案：

1. This is the pen which/that I used to write the letter.

2. The man who saved my life is a doctor.

3. The park where we often go is beautiful.

4. The book which/that he gave to me is very interesting.

5. The woman whose son is a student is my teacher.

四、解题技巧与注意事项

1. 确定先行词：首先要找到被修饰的名词或代词，即先行词。

2. 选择关系词：根据先行词的指代(人/物/地点/时间/原因)以及关系词在从句中的作用(主语/宾语/定语/状语)来选择合适的关系词。

3. 分析句子结构：要分析定语从句的结构，明确关系词在从句中的成分，避免遗漏或误用。

4. 注意that的用法：that可以代替who, whom, which，但在某些情况下必须使用that，例如先行词被all, every, no, little, much, the first, the last, the only, the very等词修饰时。

5. 非限制性定语从句：非限制性定语从句对先行词起补充说明作用，用逗号与主句隔开，关系代词不能用that，关系代词做宾语时不能省略。

五、进阶练习

尝试自己编写一些含有定语从句的句子，并分析句子的结构。多做练习，才能真正掌握定语从句的用法。 例如，可以描述你最喜欢的电影、书籍、人物或者城市。

希望通过本次专项训练，同学们能够更加熟练地掌握定语从句，并在考试中取得优异的成绩。记住，语法学习需要持之以恒的练习和积累，加油！