I / +
I'm in the theater.
He / ?
Is he in the airport?
we / ?
Are we in the post office?
they / -
They aren't at school.
you / +
You're in the school.
she / +
She's in the shop.
We / -
We aren't in the police station.
We / -
We aren't in the cafe.
you / ?
Are you in the post office?
I / -
I'm not in the police station.
It / -
It isn't in the airport.
he / +
He's in the shop.
they / ?
Are they in the hospital?
I / ?
Am I in the theater?
they / -
They aren't in the cafe.