IN: Which person is they?
Martial Arts actors are often accused as being frauds by the public since they can only fight in fake scenarios.
OUT: Martial Arts actors

IN: Which person is they?
The army organized their forces to sneak past the Decepticons in the city because they needed to use stealth to their advantage.
OUT: The army

IN: Which person is she?
Nancy adopted a baby girl because she was picked to be adopted.
OUT: a baby girl

IN: Which person is he?
John thanked Bill because he had needed help.
OUT:
John