What are they doing?
they're watching TV
What is this person doing?
it's solving a puzzle (doing a jigsaw / puzzle)
What is she doing?
she's painting
What is this person doing?
it's drawing
What's they are doing?
they're playing music instruments
What are they doing?
they're playing ice hockey
What's he doing?
he's taking photos
What's she doing?
she's rollerblading (in-line skating)
What's she doing?
she's reading
What's he doing?
he's skateboarding
What are they doing?
they're playing cards
What's he doing?
he's playing golf
What are they doing?
they're playing board games
What are the public doing?
they're watching a play
What are they doing?
they're playing video / computer games
What sport is he playing?
he's playing basketball
