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 worked sincefor a mounth.

4. We've been together only sincefor a few days.

5. We haven't seen Mary sincefor the party.

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

7. They have been raising horses and cows on their farm sincefor many years.

8. John and Bob have been working on this project sincefor five months already.

9. He worked at that company sincefor ten years before he retired.

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