What's he doing?
He's throwing.
What's she doing?
She's running.
What's she doing?
She's skating.
What's she doing?
She's singing.
What's he doing?
He's skipping.
What's he doing?
He's hitting.
What's he doing?
He's catching.
What's she doing?
She's dancing.
What's he doing?
He's riding a bike.