Since или for. Урок английского языка

1. I haven't worked sincefor a mounth.

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

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

4. They haven't visited us sincefor Christmas.

5. You have been watching TV sincefor hours.

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

7. Jane has worked here sincefor two weeks already.

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. They've been in love sincefor three weeks.