Ex2
1. They're
2. I'm
3.Kelly's
4. We aren't
5. He isn't
6. I'm not
7. We're
ex3.
You are not from Germany. He isn't Australian.
They aren't all students. He isn't 19. We aren't in New York. I'm not a Spanish speaker. The answer's not on the board.
ex4.
1.our
2.her
3.their
4.my
5.it's
6.his
7.your