定语从句作为英语语法中的重要组成部分，能够丰富句子结构，使表达更为精准。本文精选50个简单易懂的定语从句例句，旨在帮助学习者快速掌握其基本用法。例句涵盖不同类型的定语从句，并突出显示关键词，以方便读者理解和记忆。

1. The book that I borrowed from the library is very interesting. （这本书，是我从图书馆借的，非常有趣。）

2. The girl who is wearing a red dress is my sister. （那个穿着红裙子的女孩是我的妹妹。）

3. This is the house where I was born. （这是我出生的房子。）

4. He is the man whom everyone respects. （他是每个人都尊敬的人。）

5. Summer is the season when people often go on vacation. （夏天是人们经常去度假的季节。）

6. The reason why he was late is unknown. （他迟到的原因尚不清楚。）

7. The pen which I bought yesterday is already broken. （我昨天买的笔已经坏了。）

8. She is the teacher whose class I enjoy the most. （她是我最喜欢的老师，她的课我最喜欢。）

9. I saw a movie that made me cry. （我看了一部让我哭泣的电影。）

10. This is the restaurant where we had our first date. （这是我们第一次约会的餐厅。）

11. The student who studies hard will succeed. （努力学习的学生将会成功。）

12. The car that he drives is very expensive. （他开的车非常昂贵。）

13. The city where I live is beautiful. （我居住的城市很美丽。）

14. The woman whom I met at the party is a doctor. （我在聚会上遇到的那位女士是一位医生。）

15. That was the day when I graduated. （那是我毕业的那一天。）

16. The reason why she left remains a mystery. （她离开的原因仍然是个谜。）

17. The computer which I use for work is very old. （我工作用的电脑很旧了。）

18. He is a writer whose books are very popular. （他是一位作家，他的书非常受欢迎。）

19. I have a friend who is from France. （我有一个来自法国的朋友。）

20. The house that Jack built is very sturdy. （杰克建造的房子非常坚固。）

21. The dog that barks loudly belongs to my neighbor. （那条大声吠叫的狗属于我的邻居。）

22. The boy who helped me carry my bags was very kind. （帮我拿包的男孩非常友善。）

23. The park where we often play is closed for renovation. （我们经常玩的公园因翻修而关闭。）

24. The artist whom the gallery represents is very talented. （画廊代表的艺术家非常有才华。）

25. The year when the Olympics were held was exciting. （举办奥运会的那一年令人兴奋。）

26. The reason why the project failed is due to poor planning. （项目失败的原因是由于计划不周。）

27. The phone which I use to call my family is old. （我用来给家人打电话的手机很旧。）

28. She is a singer whose voice is beautiful. （她是一位歌手，她的声音很美妙。）

29. The man who is standing at the door is my father. （站在门口的男人是我的父亲。）

30. The apple that I ate was delicious. （我吃的苹果很美味。）

31. The movie which won the award was very moving. （获得奖项的电影非常感人。）

32. People who exercise regularly are healthier. （经常锻炼的人更健康。）

33. The place where I want to travel is Japan. （我想旅行的地方是日本。）

34. The actor whom the audience adores is very humble. （观众崇拜的演员非常谦虚。）

35. The moment when I received the news was unforgettable. （我收到消息的那一刻令人难忘。）

36. The reason why I like this city is its friendly people. （我喜欢这座城市的原因是这里的人们很友好。）

37. The painting that hangs on the wall is very valuable. （挂在墙上的画非常珍贵。）

38. He is a musician whose music inspires many people. （他是一位音乐家，他的音乐激励了很多人。）

39. The book that I am reading is about history. （我正在读的这本书是关于历史的。）

40. The flower which I picked from the garden is fragrant. （我从花园里摘的花很香。）

41. The song that she sang was beautiful. (她唱的歌很美妙)

42. The person who helped me the most was my mentor. (帮助我最多的人是我的导师)

43. The town where I grew up is very small. (我长大的小镇非常小)

44. The employee whom the manager promoted is very hardworking. (经理提升的员工非常勤奋)

45. The time when I feel happiest is when I am with my family. (我最快乐的时候是和我家人在一起的时候)

46. The reason why I chose this job is because of the opportunity for growth. (我选择这份工作的原因是因为有成长机会)

47. The instrument which he plays is the guitar. (他演奏的乐器是吉他)

48. He is an architect whose designs are innovative. (他是一位建筑师，他的设计很有创意)

49. The story that she told us was very interesting. (她给我们讲的故事很有趣)

50. The coffee that I drank this morning was strong. (我今天早上喝的咖啡很浓)

这些例句涵盖了that、who、where、whom、when、why和whose等常见的关系词，以及不同类型的先行词，旨在为学习者提供一个全面的定语从句学习资源。通过仔细研读这些例句，并结合实际运用，相信学习者能够更好地理解和掌握定语从句的用法，从而提升英语表达能力。建议读者结合自身的学习情况，选择适合自己的例句进行反复练习，以便更好地掌握定语从句的语法规则。