在初中英语学习中，定语从句是一个重要的语法知识点。它是一种用来修饰名词或代词的句子结构，通常由关系代词（如who, whom, whose, which, that）或关系副词（如where, when, why）引导。为了帮助大家更好地掌握这一知识点，下面我们将通过一些专项练习题来加深理解。
练习题一：
1. The girl ________ is reading under the tree is my sister.
A. whoB. whomC. whoseD. which
2. The book ________ you borrowed from the library is very interesting.
A. whoB. whomC. whoseD. which
3. The man ________ gave us a speech last week is our new teacher.
A. whoB. whomC. whoseD. which
练习题二：
4. The school ________ I visited last year is now much bigger.
A. whereB. whenC. whichD. why
5. The reason ________ he was late was that he missed the bus.
A. whyB. whichC. whoD. what
6. The park ________ we had a picnic last Sunday is beautiful.
A. whereB. whenC. whichD. why
练习题三：
7. This is the house ________ I lived in five years ago.
A. whereB. whenC. whichD. why
8. The boy ________ mother is a doctor studies hard.
A. whoB. whomC. whoseD. which
9. The film ________ we watched yesterday was fantastic.
A. whoB. whomC. whoseD. which
通过以上练习题，我们可以看到定语从句的基本用法和形式。希望大家能够通过这些题目巩固所学知识，并在实际应用中灵活运用。记住，定语从句的关键在于正确选择关系词，使其既能引导从句又能起到连接主句和从句的作用。
在日常学习中，多做类似的练习题是非常有帮助的。同时，也可以尝试自己编写一些包含定语从句的小短文，这样不仅能提高写作能力，还能加深对语法点的理解。希望同学们在学习英语的过程中不断进步，享受语言带来的乐趣！
