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PRESENT PERFECT CONTINUOUS
Audio Installation
2 (minimum) 1/4" tape decks (2 channel)
Microphone(s)
Found 1/4" tape
'I've been doing my recording'
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.
The action is a recent activity that we're talking about in a general way, not as something completed. This is often used to explain a state that is an effect of an action.
We use the Present Perfect Continuous to show that something started in the past and has continued up until now.
Because the verb tense is in the continuous, there is an emphasis on the activity in progress. It does not use specifc time expressions such as yesterday, last week, at six o'clock. The time expressions in the present perfect continuous tense usually extend over periods of time such as this week, the last few weeks, today, this week, this morning, for two months, since March.
The Present Perfect Continuous often sounds like the action has more momentum and will continue.
So, we use the Present Perfect Continuous when we have one or more of these reasons:
Incomplete
Recent Activity
Temporary
Repetitive
Busy
Progressing
source: internet
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