Exercise 21. Use doesn't don't aren't isn't or am not
2. Don't 3. Aren't 4.am not 5.doesn't 6.aren't 7.don't 8. Isn't 9. Don't 10. Isn't 11. Doesn't 12. Aren't 13. Don't 14. Isn't 15. Doesn't 16. Aren't 17. Doesn't 18. Don't 19. Aren't 20. Don't