Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

2. I haven't slept sincefor 48 hours.

3. I haven't worked sincefor a mounth.

4. My boss has been away sincefor half a day only.

5. They have been ill sincefor Monday.

6. Dinosaurs have been extinct sincefor over 60 million years.

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.