1. I can read English books.

2. I can have a try.

3. I can buy you a book.

4. I can swim.

5. I can see you.

6. I can do it.

7. I can finish my homework.

8. I can clean the table.

9. I can draw a picture.

10. I can sing a song.

11. I can dance.

12. I can speak English.

13. I can play basketball.

14. I can eat.

15. I can play.

这些句子涵盖了基本的生活技能、学习能力和娱乐活动，非常适合三年级学生使用。希望这些例子能帮助你更好地理解和使用"I can"这个情态动词。