What's he doing?
skateboarding
What's she doing?
rollerblading / in-line skating
What are they doing?
they're ice skating
What's he doing?
he's surfing
What's he doing?
fishing
What are they doing?
playing board games
What is she doing?
painting
What are they doing?
paying video / computer games
What sport is he playing?
basketball
What are they doing?
playing ice hockey
What's she doing?
reading
What's he doing?
playing golf
What's she doing?
listening to music
What's she doing?
watching birds / bird watching
What is this person doing?
drawing
What's he doing?
taking photos
What's this person doing?
skiing
What are they doing?
playing cards
What is this person doing?
solving a puzzle / doing a jigsaw (puzzle)
What are they doing?
watching TV
Where's this?
cinema / movie theatre
What's this girl doing?
playing the piano
What's he doing?
he's snowboarding
What's she doing?
climbing
What's she doing?
running