Respuesta:
AFFIRMATIVE:
1. am
2. is
3. are
4. are
5. is
6. are
7. is
8. are
9. am
10. is
11. is
12. is
13. is
14. are
15. are
16. is
17. is
18. are
19. are
20. is
NEGATIVE:
1. am not
2. isn't
3. aren't
4. aren't
5. isn't
6. aren't
7. isn't
8. aren't
9. am not
10. isn't
11. isn't
12. isn't
13. isn't
14. aren't
15. aren't
16. isn't
17. isn't
18. aren't
19. aren't
20. isn't
