Choose "is", "am" or "are" - 2

Fill in the blanks.
1. I a boy.
2. They students.
3. She beautiful.
4. I thin.
5. You a naughty girl.
6. They fat.
7. He tall.
8. I young.
9. She my friend.
10. It a dog.
11. We friends.
12. You pretty.
13. This a football.
14. He ugly.
15. You and I brothers.