Who vs. Whom: The Simple Rule That Always Works
The difference between who and whom trips up even experienced writers. But there is one trick that works every single time — and once you learn it, you will never second-guess yourself again.
The He/Him Trick
This is the only rule you need to remember:
Who = He / She / They
Use who when you can replace it with he, she, or they.
Who is the subject of the verb.
Whom = Him / Her / Them
Use whom when you can replace it with him, her, or them.
Whom is the object of the verb or preposition.
Memory trick: Him and whom both end in m. If the answer is him, use whom.
How to Apply the Trick
Rearrange the sentence so it is no longer a question, then substitute he or him:
Example 1
"_____ wrote this letter?"
Test: "He wrote this letter." → Who
Example 2
"_____ did you invite?"
Test: "You invited him." → Whom
"Who" Examples (Subject)
- —Who is coming to the party? (He is coming.)
- —The woman who called left a message. (She called.)
- —Who wants the last slice? (He wants it.)
- —I know who did this. (He did this.)
- —Who left the door open? (She left it open.)
- —The author who wrote this novel is brilliant. (She wrote it.)
"Whom" Examples (Object)
- —Whom did you call? (You called him.)
- —The person whom she married is a doctor. (She married him.)
- —To whom should I address this letter? (Address it to him.)
- —Whom do you trust? (You trust her.)
- —The candidate whom they chose was well-qualified. (They chose her.)
- —For whom is this gift? (This gift is for him.)
Tricky Sentences
Some sentences have extra clauses that make the choice confusing. Focus only on the clause containing who/whom:
Tricky
"She is the one _____ I believe is right."
Focus on: "_____ is right" → "She is right" → who
Answer
"She is the one who I believe is right."
"I believe" is a parenthetical — ignore it when testing.
Tricky
"Give it to _____ you think deserves it."
Focus on: "_____ deserves it" → "He deserves it" → whoever
Answer
"Give it to whoever you think deserves it."
Even after "to," the pronoun is the subject of "deserves."
Whoever vs. Whomever
The same he/him rule applies:
- —Whoever finishes first can leave. (He finishes first.)
- —Give the prize to whomever you choose. (You choose him.)
- —Whoever said that was wrong. (He said that.)
- —Hire whomever you like. (You like him.)
Is "Whom" Dying Out?
In casual conversation and informal writing, "whom" is increasingly replaced by "who." Most people say "Who did you call?" rather than "Whom did you call?" and no one blinks.
However, in formal writing, academic papers, and published fiction, using "whom" correctly signals care and precision. It is especially expected after prepositions (to whom, for whom, with whom). Knowing the rule lets you make a conscious choice about formality rather than guessing.
Quick Reference
Use WHO when...
- It is the subject (doing the action)
- You can substitute "he" or "she"
- It comes before the verb
Use WHOM when...
- It is the object (receiving the action)
- You can substitute "him" or "her"
- It follows a preposition (to, for, with)
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