Since или for. Урок английского языка

1. Jane hasn't been to America sincefor 1981.

2. You haven't smoked sincefor two months.

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

4. I haven't slept sincefor 48 hours.

5. I've read two books sincefor the weekend.

6. She has been in hospital sincefor Monday.

7. I haven't talked to him sincefor last week.

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

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

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