soccer/ They/ bus/ aren't/ They're/ . /players/ drivers.
They're bus drivers. They aren't football players.
officers./soccer/ They're/ police/ aren't/ They/ . /players.
They're football players. They aren't police officers.
They're/ aren't/ They/ . / firefighters/ officers/ police
They're police officers. They aren't firefighters.
They/ bus/ aren't/ They're/ . / firefighters/ drivers.
They're firefighters. They aren't bus drivers.