Since или for. Урок английского языка

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

2. I haven't slept sincefor 48 hours.

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

4. They have been ill sincefor Monday.

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

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

7. He's been working in the field sincefor early this morning.

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

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

10. New ideas have been put into practice sincefor he was elected our leader.