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. I haven't worked sincefor a mounth.

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

5. She has been in hospital sincefor Monday.

6. They have been ill sincefor Monday.

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

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

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

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