We often use for and since with perfect tenses:
- We use for to talk about a period of time: five minutes, two weeks, six years
- We use since to talk about a point in past time: 9 o'clock, 1st January, Monday
| for | since |
| a period of time | a point in past time |
| - - - - - - - - - - - - | - • - - - - - - - - - - |
| 20 minutes | 6.15pm |
| three days | Monday |
| 6 months | January |
| 4 years | 1994 |
| 2 centuries | 1800 |
| a long time | I left school |
| ever | the beginning of time |
| etc | etc |
Look at these example sentences using for and since with the Present Perfect tense:
- I have been here for twenty minutes.
- I have been here since 9 o'clock.
- John hasn't called for six months.
- John hasn't called since February.
- He has worked in New York for a long time.
- He has worked in New York since he left school.
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