She has been sitting on the sofa.
They have been playing in the backyard for 2 hours.
He hasn't been painting since he was child.
She hasn't been using computer for 3 weeks.
How long has she been running?
How long have they been cooking dinner?
She has been sitting on the sofa.
They have been playing in the backyard for 2 hours.
He hasn't been painting since he was child.
She hasn't been using computer for 3 weeks.
How long has she been running?
How long have they been cooking dinner?