3. Run, run, run. I often run. Jump, jump, jump. You often jump. Play, play, play. They sometimes play. Runs, runs, runs. He often run s. Jumps, jumps, jumps. She often jump s. Plays, plays, plays. It usually play s.

4. 主语是 I, You ， 复数， 用 动词原形 主语是 He, She, It, 第三人称单数， 动词加 s ， es

6. usually They usually play football.

7. Sally and Janet usually play tennis.

8. He usually plays football.

9. Ben often plays the guitar.

10. She sometimes plays table tennis.

12. She doesn’t play tennis.

13. He doesn’t play the guitar. ×

14. He doesn’t play football. ×

15. He doesn’t run. ×

16. He doesn’t play badminton. ×

17. × They don’t play basketball.

18. × They don’t play tennis.

19. × Sally and Ben Sally and Ben don’t swim.

23. Does he play tennis?

27. Do they play tennis?