在英语语法中，定语从句是一种常见的句式结构，它能够帮助我们更清晰地描述名词或代词的特性。下面我们将通过10个简单的例子来理解定语从句的基本用法和特点。

例句1：

- The book that I bought yesterday is very interesting.

- 解释：这里“that I bought yesterday”是定语从句，用来修饰先行词“the book”，说明是哪本书很有趣。

例句2：

- The man who is speaking is my uncle.

- 解释：“who is speaking”是定语从句，用于描述“the man”，指出正在讲话的人是我的叔叔。

例句3：

- This is the pen which I used to write with.

- 解释：“which I used to write with”是一个定语从句，用来补充说明这支笔的具体用途。

例句4：

- The car whose door is open belongs to my neighbor.

- 解释：“whose door is open”是一个定语从句，强调车门开着的那辆车属于我的邻居。

例句5：

- She is the girl whom we met at the party last week.

- 解释：“whom we met at the party last week”是定语从句，描述上周聚会上遇到的那个女孩。

例句6：

- The city where I was born is very beautiful.

- 解释：“where I was born”为定语从句，表示我出生的城市非常美丽。

例句7：

- The movie based on a true story is very moving.

- 解释：“based on a true story”虽然看似简单，但实际也是一种隐含的定语从句，用来修饰“the movie”。

例句8：

- He is the only person that can solve this problem.

- 解释：“that can solve this problem”是一个定语从句，用来突出他是唯一能解决问题的人。

例句9：

- The school whose library has many books is near my home.

- 解释：“whose library has many books”是一个定语从句，描述附近我家的学校图书馆藏书丰富。

例句10：

- Do you know the boy whose father works in the hospital?

- 解释：“whose father works in the hospital”是一个定语从句，用来具体描述那个男孩的父亲是在医院工作的。

通过以上这些简单的例子，我们可以看到定语从句在英语中的广泛应用。它们不仅增强了句子的信息量，还使得表达更加精准和生动。希望这些实例能帮助大家更好地理解和运用定语从句！