IN: Which person is its?
Bengali is morphologically richer than English, so its vocabulary is larger.
OUT: Bengali

IN: Which person is they?
Computers outsell laptops because they are more powerful.
OUT: Computers

IN: Which person is he?
John bought a beer for Bill because he likes cool guys.
OUT: John

IN: Which person is him?
Hill joined Obama because Bill trusted him.
OUT:
Obama