1. It is not hot. It isn't hot.
2. I am not cold. I'm not cold.
3. We are brothers. We're brothers.
4. He is not my friend. He isn't my friend.
5. They are not at home. They aren't at home.
6. I am not in the garden. I'm not in the garden.
7. I am not his brother. I'm not his brother.
8. She is not my sister. She isn't my sister.
9. We are not in the living room. We aren't in the living room.
10. They are not white. They aren't white.