Since или for. Урок английского языка

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

2. I haven't slept sincefor 48 hours.

3. We've lived here sincefor seventeen years.

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

5. They haven't visited us sincefor Christmas.

6. They have been ill sincefor Monday.

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

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

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

10. Joe and Josephine have been going out together sincefor Valentine's Day.