What is he doing?
walking the dog
What is she doing?
surfing the internet
what are they doing?
playing volleyball
What's he doing?
skateboarding
what's he doing?
running
what's she doing?
borrowing books
What's she doing?
taking pictures
What are they doing?
hiking
What's he pointing at?
sneakers
what's he doing?
mailing a package
what are they doing?
watching DVDs
what are they doing?
playing catch