【定语从句例句】在英语学习中，定语从句是一个非常重要的语法知识点。它用于修饰名词或代词，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。下面是对定语从句的总结，并附上一些常见例句供参考。
一、定语从句基本结构
定语从句由一个主句和一个从句组成，从句用来修饰主句中的某个名词或代词。从句通常位于被修饰词之后，由关系词引导。
- 主句：The book is interesting.
- 定语从句：that I borrowed yesterday.
- 完整句子：The book that I borrowed yesterday is interesting.
二、常用关系词及用法
| 关系词 | 用法说明 | 举例 |
| who | 指人，作主语 | The man who is speaking is my teacher. |
| whom | 指人，作宾语 | The girl whom you met is my sister. |
| whose | 表示所属关系 | The boy whose bag was lost is crying. |
| which | 指物，作主语或宾语 | The car which I bought last week is very fast. |
| that | 指人或物，作主语或宾语 | The student that won the prize is from Class 2. |
| when | 表时间，作时间状语 | I still remember the day when we first met. |
| where | 表地点，作地点状语 | This is the house where I was born. |
| why | 表原因，作原因状语 | That’s the reason why he left early. |
三、定语从句分类
1. 限制性定语从句：紧跟被修饰词，不能省略，否则会影响句子意思。
- 例句：The man who is standing there is my father.
2. 非限制性定语从句：用逗号隔开，对前面的名词进行补充说明，不影响主句意义。
- 例句：My brother, who lives in Shanghai, is coming to visit us.
四、常见错误与注意事项
- 误用 that 和 which：that 可以指人或物，而 which 通常只指物，但在非限制性定语从句中只能用 which。
- 忽略关系词：不能省略关系词，除非它在从句中作宾语且为 that 引导。
- 混淆 who 和 whom：who 作主语，whom 作宾语，但现代英语中常省略 whom。
五、定语从句例句汇总表
| 例句 | 解析 |
| The girl who is wearing a red dress is my friend. | who 指人，作主语 |
| The book which I read last night was fascinating. | which 指物，作宾语 |
| The house where we stayed is beautiful. | where 表地点 |
| The reason why she left is unclear. | why 表原因 |
| The man whose car was stolen called the police. | whose 表所属关系 |
| The students that passed the exam will get a reward. | that 指人，作主语 |
通过以上总结和例句，可以更好地理解和运用定语从句。掌握好这一语法点，有助于提高英语表达的准确性和丰富性。