【定语从句例句大全】定语从句是英语语法中的一个重要部分，用来修饰名词或代词，使句子更加具体和清晰。定语从句通常由关系代词（如who, whom, whose, which, that）或关系副词（如when, where, why）引导。掌握定语从句的用法，有助于提高英语表达的准确性和丰富性。
以下是对常见定语从句类型的总结，并附上典型例句，帮助学习者更好地理解和运用。
一、定语从句分类与例句
| 类型 | 关系词 | 用法说明 | 例句 |
| 1. 关系代词引导的定语从句 | who | 指人，在从句中作主语 | The man who is talking to Mary is my teacher. |
| whom | 指人，在从句中作宾语 | The girl whom you met yesterday is my sister. | |
| whose | 表示所属关系 | The boy whose bag was lost is very upset. | |
| which | 指物，在从句中作主语或宾语 | The book which I bought last week is very interesting. | |
| that | 指人或物，在从句中作主语或宾语 | The car that I saw yesterday is very expensive. | |
| 2. 关系副词引导的定语从句 | when | 表时间，在从句中作时间状语 | I still remember the day when we first met. |
| where | 表地点，在从句中作地点状语 | This is the house where I was born. | |
| why | 表原因，在从句中作原因状语 | That’s the reason why she left early. |
二、定语从句使用注意事项
1. 关系词不能省略：当从句中缺少主语或宾语时，关系词不能省略。
- 正确：The man who is standing there is my father.
- 错误：The man is standing there is my father.
2. that 和 which 的区别：
- 在非限制性定语从句中，只能用 which，不能用 that。
- 正确：My brother, who lives in Beijing, is coming to visit me.
- 错误：My brother, that lives in Beijing, is coming to visit me.
3. 指人时，who 和 whom 的使用：
- who 作主语，whom 作宾语。
- 正确：The woman who is speaking is our English teacher.
- 正确：The woman whom I met yesterday is our English teacher.
4. 在“the + 名词 + that”结构中，常用于强调或限定。
- 正确：This is the only book that I have.
三、常见错误对比
| 正确例句 | 错误例句 | 错误原因 |
| The man who is wearing a hat is my uncle. | The man wearing a hat is my uncle. | 缺少关系代词，导致句子结构不完整 |
| The house where we lived is now for sale. | The house we lived is now for sale. | 缺少关系副词，影响句子完整性 |
| The reason why he left is unknown. | The reason he left is unknown. | 缺少关系副词，影响句子逻辑 |
四、总结
定语从句是英语写作和口语中不可或缺的一部分，正确使用可以增强句子的表达力和逻辑性。通过掌握不同类型的关系词及其用法，结合大量例句进行练习，能够有效提升英语语言能力。希望以上内容能帮助你更好地理解和应用定语从句。
