a. Present Perfect Continuous is used:
For actions started and finished in the past and lasted for some time. The result of the actions is visible in the present.
| He looks so tired. He has been studying for his exam.
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To express anger, annoyance or irritation.
| Who has been using my cup?
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We can use the Present Perfect Continuous to talk about longer repeated actions that have finished.
| “You look tired.” – “I have been running.”
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b. Past Perfect Continuous is used: