FUNCTIONS OF THE PRESENT PERFECT CONTINUOUS
The present perfect continuous refers to an unspecified time between 'before now' and 'now'. The speaker is thinking about something that started but perhaps did not finish in that period of time. He/she is interested in the process as well as the result, and this process may still be going on, or may have just finished.
ACTIONS THAT STARTED IN THE PAST AND CONTINUE IN THE PRESENT
She has been waiting for you all day (= and she's still waiting now).
I've been working on this report since eight o'clock this morning (= and I still haven't finished it).
They have been travelling since last October (= and they're not home yet).
ACTIONS THAT HAVE JUST FINISHED, BUT WE ARE INTERESTED IN THE RESULTS
She has been cooking since last night (= and the food on the table looks delicious).
It's been raining (= and the streets are still wet).
Someone's been eating my chips (= half of them have gone).
For and Since with Present Perfect Continuous Tense
We often use for and since with the present perfect tense.
- We use for to talk about a period of time - 5 minutes, 2 weeks, 6 years.
- 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
|a long time
||I left school
||the beginning of time
Here are some examples:
- I have been studying for 3 hours.
- I have been watching TV since 7pm.
- Tara hasn't been feeling well for 2 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.