6. Last year she was 16, so she is 17 now.
7. Are you interested in sports?
8. The shops are open today, but tomorrow they will be closed.
9. I phoned you yesterday but you were not at home.
10. I am hungry. Can I have something to eat.
Пояснение: употребление форм глагола be зависит от того, какого числа и лица подлежащее и времени.