We_(play) volleyball for twenty minutes.
She_(clean) the flat for more than an hour.
Peter_(swim) for half an hour.
Anna _(speak) on the phone for an hour now.
You_(wait) for a bus for ten minutes only.
Nelly and Mery_(do) the shopping since early morning.
It_(snow) since last night
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Ответ:

We have been playing volleyball for twenty minutes. 3. She has been cleaning the flat for more than an hour. 4. Peter has been swimming for half an hour. 5. Anna has been speaking on the phone for an hour now. 6. You have been waiting for a bus for ten minutes only. 7. Nelly and Mary have been doing the shopping since early morning. 8. It has been snowing since last night

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