For and Since with Present Perfect Continuous Tense
We often use for and since with perfect tenses:
- We use for to talk about a period of time: three hours, two months, one decade
- We use since to talk about a point in past time: 9 o'clock, 1st January, Monday
|a period of time||a point in past time|
|- - - - - - - - - - - -||- • - - - - - - - - - -|
|ages||I left school|
|ever||the beginning of time|
Look at these example sentences using for and since with the Present Perfect Continuous tense:
- I have been studying for three hours.
- I have been watching TV since 7pm.
- Tara hasn't been feeling well for two weeks.
- Tara hasn't been visiting us since March.
- He has been playing football for a long time.
- He has been living in Bangkok since he left school.
For can be used with all tenses. Since is usually used with perfect tenses only.