Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

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

3. We've lived here sincefor seventeen years.

4. I haven't worked sincefor a mounth.

5. They have been ill sincefor Monday.

6. You have been watching TV sincefor hours.

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

8. Jane has worked here sincefor two weeks already.

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

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