Since или for. Урок английского языка

1. I haven't slept sincefor 48 hours.

2. I haven't worked sincefor a mounth.

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

4. They haven't visited us sincefor Christmas.

5. She has been in hospital sincefor Monday.

6. They have been ill sincefor Monday.

7. Dinosaurs have been extinct sincefor over 60 million years.

8. Jane has worked here sincefor two weeks already.

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

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