IN: Which person is he?
The professor highly recommends the student because he appreciates an inquisitive mind.
OUT: The professor

IN: Which person is they?
LA Galaxy is constantly seeking famous players to fill their ranks, but they are constantly sought after by many teams with offers.
OUT: famous players

IN: Which person is she?
Stephanie gave Brandy flowers because she was sick.
OUT: Brandy

IN: Which person is it?
The ball broke the window because it was fragile.
OUT:
the window