Since или for. Урок английского языка

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

2. We've lived here sincefor seventeen years.

3. I haven't worked sincefor a mounth.

4. She has been in hospital sincefor Monday.

5. You have been watching TV sincefor hours.

6. Jane hasn't been back to Hungary sincefor last year.

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

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

9. He's been working in the field sincefor early this morning.

10. They've been in love sincefor three weeks.