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. We've been friends with Fred sincefor decades.

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

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

7. They have been ill sincefor Monday.

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

9. These cherry trees have bloomed every spring sincefor 1980.

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