IN: Which person is he?
Kyle purchased three new monitors due to a recommendation by his brother, because he wanted to increase his productivity.
OUT: Kyle

IN: Which person is they?
The civilians had to flee the encampment from the thugs because they feared for their lives.
OUT: The civilians

IN: Which person is they?
The environmentalists were angry at the corporation because they had ignored their proposal.
OUT: the corporation

IN: Which person is they?
The police arrested suspected members of Anonymous because they are accused of hacking company data.
OUT:
Anonymous