IN: Which person is he?
John ridiculed Bill because he was a big help.
OUT: Bill

IN: Which person is they?
The wolves attacked the travelers in the forest, but they managed to escape unscathed.
OUT: the travelers

IN: Which person is he?
Henry changed Jack's oil, because he gave him money.
OUT: Jack

IN: Which person is he?
Jimbo eats more than Bobbert because he is on a diet.
OUT:
Bobbert