Since или for. Урок английского языка

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

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

3. I haven't slept sincefor 48 hours.

4. I haven't worked sincefor a mounth.

5. She has been in hospital sincefor Monday.

6. Jane hasn't been back to Hungary sincefor last year.

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

8. Jane has worked here sincefor two weeks already.

9. John and Bob have been working on this project sincefor five months already.

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