10. You should practice (practice) your Enlish more often.

11. We ( not go )………………to school tomorrow.

12. Sarah ( paint ) ……………. The picture later.

13. He ( work ) ……………hard every day.

14. She ( talk ) ………….to Peter now .

15. Mr Green ( not be )………………..in his office yesterday morning.

16. We ( not sell)…………………our house last month.

17. They ( not be )…………………at home last night.

18. They ( buy ) ………………..a new LCD TV set last week .

19. We ( finish )……………..the work yesterday.

20. My mother ( work ) ……………….in her office at this moment .