Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

2. I haven't slept sincefor 48 hours.

3. I haven't worked sincefor a mounth.

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

5. She has been in hospital sincefor Monday.

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

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

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

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

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