2. David is not unhappy.
4. My brother and I are not Spanish.
5. Peter and Mark are not at home.
6. The cat is on the table.
7. It is a very nice day.
8. Are they good friends?
9. Is he your friend?
10. We are not students.
11. Am I a student?
12. I study every day.
13. Is my cousin in the school?
14. Are they friends?
15. Is he a teacher?