COMMON GRAMMAR & STYLE ISSUES
That / Which / Who
“That” and “which” are used to modify objects. In many cases, they are
interchangeable. “That” should almost always be used with restrictiveclauses (clauses that change the meaning of the sentence if removed):
I want the pen that glows in the dark.
“Which” is most commonly used with non-restrictive clauses (nonessential “additions” to the sentence):
She chose the glow-in-the-dark pen, which is one of my favorites.
“Who” / “whom” is used to modify a person:
He was the one who gave me the directions.
Who / Whom
“Who” is used to modify a subject of a sentence or question:
Dr. Smith, who is also a chiropractor, co-hosted the recruitment
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