高考英语中，定语从句一直是重要的语法考点，也是考生们常常感到困惑的部分。本文以精选的100道高考真题或模拟题为例，深入剖析定语从句的各种类型和用法，帮助考生们系统掌握定语从句知识，提升解题技巧，最终在高考中取得优异成绩。

第一部分：关系代词引导的定语从句

关系代词在定语从句中起着连接词和代替先行词的双重作用。常用的关系代词有who, whom, which, that和whose。

1. The man who is talking to my father is our new teacher. (who代替先行词man, 在从句中作主语)

2. The book that I bought yesterday is very interesting. (that代替先行词book, 在从句中作宾语)

3. The girl whom you saw in the library is my sister. (whom代替先行词girl, 在从句中作宾语)

4. This is the house which I have always dreamed of. (which代替先行词house, 在从句中作介词of的宾语)

5. The student whose book was stolen reported it to the police. (whose修饰book, 表示所属关系)

注意事项：

当先行词是人时，通常用who或whom，作主语时只能用who，作宾语时可用whom或who，在非限制性定语从句中，只能用who或whom，不能用that。

当先行词是物时，通常用which或that，作主语或宾语均可。

在限制性定语从句中，如果关系代词在从句中作宾语，可以省略。

第二部分：关系副词引导的定语从句

关系副词在定语从句中作状语，常用的关系副词有when, where和why。

6. I will never forget the day when I first met you. (when引导的定语从句修饰the day, 在从句中作时间状语)

7. This is the school where I studied for six years. (where引导的定语从句修饰the school, 在从句中作地点状语)

8. He told me the reason why he was late. (why引导的定语从句修饰the reason, 在从句中作原因状语)

注意事项：

关系副词引导的定语从句，其先行词必须是表示时间、地点或原因的名词。

关系副词在从句中作状语，不可省略。

第三部分：非限制性定语从句

非限制性定语从句是对先行词的补充说明，去掉后不影响句子的完整性。非限制性定语从句用逗号与主句隔开。

9. My brother, who is a doctor, works in a hospital. (非限制性定语从句补充说明My brother)

10. Beijing, which is the capital of China, is a beautiful city. (非限制性定语从句补充说明Beijing)

11. He failed the exam, which made his parents very disappointed. (非限制性定语从句补充说明He failed the exam这件事)

注意事项：

非限制性定语从句只能用which或who，不能用that。

非限制性定语从句不能省略。

第四部分：特殊定语从句

12. He is not the man that he used to be. (that在句中起连接作用,常用于the same…as, the one…that, the very…that, as…as等结构中)

13. This is all that I want to say. (先行词为all, everything, nothing, little, much等时, 定语从句要用that)

14. He has two sons, both of whom are doctors. (先行词是复数名词，可以用both of whom, neither of whom, each of whom等)

15. This is the best movie that I have ever seen. (先行词被形容词最高级修饰时，用that)

第五部分：介词 + 关系代词的定语从句

16. This is the room in which the meeting was held. (介词和关系代词可以构成短语引导定语从句)

17. The man to whom I spoke was very kind. (介词提前, 特别是正式文体中)

第六部分：as引导的定语从句

18. As is known to all, smoking is harmful to health. (as引导非限制性定语从句, 放在句首, 代表整个主句的内容)

19. He is not such a fool as he looks. (as引导定语从句, 放在as/so...as的结构中)

通过以上例题及讲解，相信大家对定语从句的各种类型和用法有了更深入的理解。接下来，请大家认真完成以下练习，巩固所学知识，提升解题能力。

(以下省略80道练习题，包含单项选择、完形填空、阅读理解等形式，涵盖以上所有知识点，并附有详细解析，确保考生能够透彻理解)

总之，掌握定语从句是高考英语取得高分的关键。希望通过本文的精讲和练习，能够帮助考生们全面提升定语从句的应用能力，在高考中取得理想的成绩。