Radek is playing chess.
Is Radek playing chess?
Radek isn't playing chess.
Marek is kicking Michał.
Is Marek kicking Michał?
Marek isn't kicking Michał.
Natalia is listening to disco polo.
Is Natalia listening to disco polo?
Natalia isn't listening to disco polo.
Aneta and Michał are eating hamburgers.
Are Aneta and Michał eating hamburgers?
Aneta and Michał aren't eating hamburgers.
We are drinking orange juice.
Are we drinking orange juice?
We aren't drinking orange juice.