№4. преобразуйте предложения в отрицательные: 13. your uncle is a teacher. 14. the sisters were famous dancers. 15. she will go to bed at 11 o’clock. 16. my mother prepared dinner yesterday.

13) Your uncle not is a teacher.

13. Your uncle is not a teacher.
14. Your sister weren't famous dancers.
15. She won't go to bed at 11 o'clock.
16. My mother didn't prepare dinner yesterday.