1. .......for.......... some days

2. ........for......... a long time

3. .........since........ last month

5. ......since...........he was ten

6. .......since.......... ladt year

7. ......since...........10 o'clock

8. ......for...........a week

9. .......for.......... a year

10. .....for......... an hour

11. ...for........... 4 centuries

12. .......since...... I came

13. ......for........ many times

14. .......for...... so long time

15. ......since......... last week

16. ....for.......... ten hours

17. ....since.......... 2005

18. ......since.......yesterday

19. ....for..........ages

20. ......for........ several times.

21. .......since...... she came