1. I like dogs.

2. You like cats.

3. He likes snacks.

4. She likes flies.

5. We like animals.

6. I buy a book.

7. You buy a book.

8. He buys a book.

9. She buys an interesting book.

10. I work hard on weekdays.

11. The sun sets in the west.

12. He plays basketball every Saturday.

13. The dog barked.

14. She likes to read books in her free time.

15. The baby often smiles.

16. The teacher is coming.

17. My cat is sleeping on the couch.

18. The man walked.

19. The woman ran.

20. I jump.

这些句子展示了主谓结构在不同语境下的应用，包括个人喜好、日常活动、自然现象等。主谓结构是英语中简单句的五种基本句型之一，通常由主语和谓语构成，有时还会有宾语、定语、状语等补充成分。