IN: Which person is he?
Rick Davis campaigned for John McCain since he could best support him in office.
OUT: Rick Davis

IN: Which person is he?
David hit Bill and he cried.
OUT: Bill

IN: Which person is they?
NASA helped the Autobots to exile from the planet after they were told to leave.
OUT: the Autobots

IN: Which person is they?
New York City was grateful for the sacrifices the American Armed Forces did to save their city because they managed to divert a devastating attack.
OUT:
the American Armed Forces