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