What have these people been doing?
They've been having heavy lunch/dinner.
What has this girl been doing?
She's been crying.
What has this woman been doing?
She's been shopping/ doing the shopping.
What have these people been doing?
They've been painting their house.
What has this girl been doing?
She's been studying all night.
What has this man been doing?
He's been running.
What have these people been doing?
They've been fighting/arguing.
What have these people been doing?
They've been playing in mud.
What has this man been doing?
He's been playing tennis.