IN: Which person is she?
Lucy gave a tutorial on how to install IOS 5 to Cindy because she is not very technologically savvy.
OUT: Cindy

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 he?
John nicked Bill because he was gullible.
OUT: Bill

IN: Which person is they?
Horses are faster at short distances than camels, but they can travel much further distances.
OUT:
camels