1
1 have already flown
2 has forgotten
3 has just come
4 has been painting
5 have been
6 has been
2
We have been reading Chekhov stories in the park for three hours.
They have read two stories.
Mum has been knitting in the living room since morning.
Dan has been travelling around the USA for 2 weeks.
He has visited 4 countries already.