What's she doing?
she's climbing
What's she doing?
she's running
What's he doing?
he's skateboarding
What are they doing?
they're playing video / computer games
What's she doing?
she's reading
What are the public doing?
they're watching a play
What are they doing?
they're watching TV
What's she doing?
she's listening to music
What's he doing?
he's surfing
What are they doing?
they're playing board games
What's the person doing?
it's writing (stories, letters, blogs)
What sport is he playing?
he's playing basketball
What's this person doing?
it's skiing
What are they doing?
they're ice skating
What are they doing?
they're playing ice hockey
What's he doing?
he's fishing
What is this person doing?
it's drawing
What is this person doing?
it's solving a puzzle (doing a jigsaw / puzzle)
What's he doing?
he's snowboarding
What is she doing?
she's painting
What's he doing?
he's playing golf
what is the person doing?
it's shopping
What are they doing?
they're playing cards
What's they are doing?
they're playing music instruments
What's she doing?
she's watching birds ( bird watching)
what are they doing?
they're gardening
What's he doing?
he's taking photos
What's she doing?
she's rollerblading (in-line skating)