高中英语定语从句是修饰名词或代词的从句，由关系代词或关系副词引导。专练题目包括使用关系代词“who”，“which”，“whose”，关系副词“where”，“why”，和“when”的例子，旨在帮助学生巩固知识点，提高英语语法水平。
题目一
- The boy {who is standing over there} is my friend.
- The book {which is on the table} is mine.
- The teacher {whose daughter is in my class} is very strict.
题目二
- The girl, {whom I met yesterday}, is from Canada.
- The company, {which was founded in 2005}, is now very successful.
- The man, {whose car was stolen}, reported it to the police.
题目三
- The school {where I studied} is very famous.
- The reason {why she was late} is because of the traffic.
- The period {when dinosaurs lived} was millions of years ago.
题目四
- The shirt {that I bought yesterday} is very comfortable.
- The building {which is under construction} will be a hotel.
- The woman {whose son is a doctor} is very proud.
