IN: Which person is him?
Jacob misled Amen so David fired him.
OUT: Jacob

IN: Which person is him?
David hit Bill because Mary asked him to.
OUT: David

IN: Which person is it?
A monkey ate a lizard and it licked its lips.
OUT: A monkey

IN: Which person is they?
Consultants are hired by companies to perform specialized tasks, but they do not always have money in the budget to hire these services.
OUT:
companies