1. To put emphasis on the duration of an action which started in the past and continues up to the present.
He has been studying English since he was 10.
2. For an action that has recently\just stopped and its results are visible in present.
She has been working all day. She’s tired now.
1. She has walked 10 km. (for 3 hours).
2. I have been talking to Ann on the phone since 2 o’clock._____(just).
3.Nick has learned this poem by heart! (all morning)!
4. Mummy has been cooking for 2 hours. (yet)
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