Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

2. We've been friends with Fred sincefor decades.

3. I haven't slept sincefor 48 hours.

4. We've lived here sincefor seventeen years.

5. They haven't visited us sincefor Christmas.

6. She has been in hospital sincefor Monday.

7. They have been ill sincefor Monday.

8. You have been watching TV sincefor hours.

9. He hasn't played the piano sincefor he was a boy.

10. These cherry trees have bloomed every spring sincefor 1980.