What are they doing?
They're watching a film.
What are they doing?
They are playing board games.
What's she doing?
She's swimming.
What's he doing?
He's reading comic books./He's reading a comic book.
What's she doing?
She's jumping rope.
What are they doing?
They're playing video games.
What are they doing?
They're singing.
What's he doing?
He's listening to music.