1)Helen learns English at the institute. She has been learning English since last autumn.
2)They are busy now. They are discussing an important question. They have been discussing it since five o'clock.
3)Where is Petrow? - He is working in the library. -Has he been working long? - Yes, he has been working since morning.
4)My brother is in hospital. He has been there for ten days.
Удачи тебе :)