Преобразуйте предложения в во и отрицательные.

1. She had been working in the library for 3 years before she entered the Philology Faculty.

2. She has been growing those flowers for the whole summer.

3. They had been taking the examination for 3 hours when the dean came.

4. We have been studying Russian for 10 years.

5. My brother has been staying with us for 3 weeks.

6. They had been watching TV for half an hour when their parents came.

7. He will have been writing a letter for three hours when you come.

8. She will have been watching this film for an hour tomorrow when you ring her up.

9. It has been snowing heavily the whole night.

10. She had been studying French for 5 years before she could speak it fluently.