1. I'm not fifteen.
2. My best friend is not my cat.
3. My brother's name is not Ben.
4. We aren't at home.
5. It isn't my birthday.
6. My neighbours aren't my classmates.
Ответ: I'm not fifteen; My best friend is not my cat; My brother's name is not Ben; We aren't at home; It isn't my birthday; My neighbours aren't my classmates.