在学习英语的过程中，语法是构建语言能力的重要基石。为了帮助大家更好地掌握英语语法知识，以下是一些精心挑选的专项练习题，涵盖了常见的语法点和实用场景。
一、选择题
1. The book ________ on the table when I left.
A. was B. is C. has been D. had been
2. If she ________ free tomorrow, we will go to the park.
A. is B. will be C. was D. would be
3. She ________ her homework every evening.
A. does B. did C. has done D. will do
4. By the time he arrives, we ________ dinner.
A. will have eaten B. eat C. have eaten D. are eating
5. They ________ to the museum last weekend.
A. went B. go C. have gone D. will go
二、填空题
6. I ________ (not see) him since last year.
7. He ________ (live) in New York for ten years before moving here.
8. We ________ (study) English for three hours yesterday.
9. She ________ (write) a letter when I called her.
10. They ________ (visit) their grandparents next summer.
三、改错题
11. The students was studying when the teacher came in.
改正：__________
12. If he will come tomorrow, we will invite him to the party.
改正：__________
13. She has bought this book two weeks ago.
改正：__________
14. They are going to have finished their project by Friday.
改正：__________
15. I am learning English since five years.
改正：__________
通过这些练习题，大家可以巩固和提高自己的英语语法水平。语法的学习需要不断的实践和总结，希望这些题目能够帮助大家找到学习的乐趣，并在实际应用中更加得心应手。记得定期复习和回顾，这样才能真正掌握这些知识点哦！
