Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

2. I haven't met Jill sincefor the end of the school.

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

4. I haven't slept sincefor 48 hours.

5. We've lived here sincefor seventeen years.

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

7. They have been ill sincefor Monday.

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 teaching here sincefor quite a long time.