for+or+since?


 * FOR**: when the period of time is given
 * 2 minutes, 3 hours, 4 days, 5 weeks, 6 months, 1 year...
 * ages
 * a long time


 * SINCE**: when the starting point of an action is given
 * two o'clock
 * January
 * 2009
 * I was ten years old
 * 2 weeks ago
 * last Friday, last week...

Do the following exercises to practise:
 * exercise 1
 * exercise 2
 * exercise 3
 * exercise 4
 * exercise 5
 * exercise 6
 * exercise 7
 * exercise 8
 * exercise 9
 * exercise 10
 * exercise 11
 * exercise 12 (present perfect simple and //for// or //since//)