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