Quick Lessons
Who vs. Whom: A Simple Test That Works
Learn when to use who and when to use whom with a quick substitution test, plus examples and common mistakes.
By Vocabaura Editorial · Published 6 August 2026 · 3 min read
Quick answer
Use who for the subject of a verb (the one doing the action) and whom for the object (the one receiving the action). If you can answer the question with “he” or “she,” use who; if you'd answer with “him” or “her,” use whom.
Who and whom trip up even confident writers, mostly because whom has quietly disappeared from casual speech. But the rule behind it is straightforward once you know where to look: it's all about whether the word is doing the action or receiving it.
Quick Answer
Who is a subject pronoun, like “he” or “she.” Whom is an object pronoun, like “him” or “her.” Use who when the person is performing the verb’s action, and whom when the person is on the receiving end of it or follows a preposition.
The He/Him Test
The fastest way to check is to mentally rephrase the question or clause as a statement using “he” or “him.” If “he” fits, use who. If “him” fits, use whom. Both who and whom end in the same letter as their matching pronoun — who/he, whom/him — which makes the test easy to remember.
Who (subject)
Who called you last night? — He called you. → who.
Whom (object)
Whom did you call last night? — You called him. → whom.
Whom (after preposition)
To whom should I address this letter? — Address it to him. → whom.
Who (subject of clause)
Give the award to whoever wins the race. — He wins the race. → whoever, not whomever.
The Key Difference
Who always acts; whom is always acted upon or governed by a preposition (to, for, with, from, by). In formal writing, especially after prepositions, whom is still expected: “the woman with whom I spoke,” not “the woman with who I spoke.”
| Who | Whom | |
|---|---|---|
| Role | Subject | Object |
| Matches | he, she, they | him, her, them |
| Typical position | Before a verb | After a preposition or verb |
| Formality | Common in speech and writing | Mostly formal or written English |
Common Mistakes
- Using “who” after a preposition in formal writing: “the person to who I gave the keys” should be “to whom.”
- Overcorrecting and using “whom” as a subject: “Whom is calling?” should be “Who is calling?”
- Confusing whoever/whomever the same way — check the pronoun inside the clause, not the sentence as a whole.
- Assuming whom is always more correct; it's only correct when the word is an object.