对话内容：
Do you know the man who is standing there？
回答：Yes. He is my teacher who teaches maths.
解释：在这个对话中，“who is standing there”是一个定语从句，修饰“man”，说明这个人是“我”的老师，并且教数学。
对话内容：
What is the book that you are reading？
回答：The book that I am reading is "To Kill a Mockingbird."
解释：这里，“that I am reading”是一个定语从句，修饰“book”，说明这本书是“我”正在读的。
对话内容：
Who is the girl that you saw at the party last night？
回答：The girl that I saw at the party last night is my cousin.
解释：在这个对话中，“that I saw at the party last night”是一个定语从句，修饰“girl”，说明这个女孩是“我”昨晚在聚会上看到的表妹。
对话内容：
Where is the car that you parked in front of the house？
回答：The car that I parked in front of the house is gone.
解释：这里，“that I parked in front of the house”是一个定语从句，修饰“car”，说明这辆车是“我”昨天停在家前面的。
对话内容：
Did you help the boy who was lost？
回答：Yes, I helped the boy who was lost and brought him back home.
解释：在这个对话中，“who was lost”是一个定语从句，修饰“boy”，说明这个男孩是“我”帮助的那个迷路的男孩。
这些例句展示了定语从句在英语对话中的常见用法，帮助你更好地理解和运用这一语法结构。
