Pronoun-Antecedent Reference and Agreement.
Use Who to Refer to People, That
to Introduce Essential Clauses, and
Which to Introduce Nonessential Clauses
Pronouns and antecedents should agree in the
proper use of the relative pronouns to:
Refer either to persons or to things
Introduce either essential or nonessential
clauses (although not strictly an agreement
principles governing the use of relative pronouns
are summarized as follows:
1. Who, whom, and whose refer
to humans (although whose is also used
to refer to things other than humans) and can
introduce either essential or nonessential clauses. 2. That refers to things other
than humans and is used to introduce essential
clauses. 3. Which refers to things other
than humans and is used to introduce nonessential
Instead of saying "The police officer
that made the arrest," say "The police
officer who made the arrest."
Instead of saying "The company who
bought the materials," say "The company
that bought the materials."