🤔 Grammar · Commonly Confused Words
Who vs Whom
The subject pronoun and the object pronoun — a simple swap-in test settles this pair every single time.
Grammar › Commonly Confused Words › Who vs Whom
The rule in one sentenceUse who for the subject doing the action and whom for the object receiving it — if you can answer with “he/she”, use who; if you’d answer with “him/her”, use whom.
Subject vs object — the he/him test
Who and whom refer to people, but they play different grammatical roles — exactly like he and him, or she and her. Who is a subject pronoun: it does the verb’s action. Whom is an object pronoun: the action happens to it.
Who directed Hoosiers? Answer: He directed it — David Anspaugh is the subject, so the question needs who. Whom did David Anspaugh cast as the coach in Hoosiers? Answer: He cast him — the actor is the object of “cast”, so the question needs whom.
The test is simple: mentally answer the question with a pronoun. If your answer is he or she, the question needs who. If your answer is him or her, the question needs whom. Both “whom” and “him”/”her” end in “m” or a similar sound — a handy memory hook.
🎬 Compare: “Who directed Field of Dreams?” (subject — he directed it, Phil Alden Robinson) vs. “To whom did the studio give the lead role in Field of Dreams?” (object of “to” — they gave it to him, Kevin Costner).
Same award ceremony, two completely different grammatical jobs.
Whom also shows up straight after a preposition — to, for, with, by, of. Native speakers rarely say “who” directly after one of these words in careful writing: With whom did Sean Astin share the screen in Rudy? (Ned Beatty).
How to build it
Who — the subject
Does the verb. Swap test: replace with he/she.
🎬 Who directed Moneyball? — He directed it (Bennett Miller).
🎬 Morgan Neville is the director who made 20 Feet from Stardom an Oscar winner.
Whom — the object
Receives the verb’s action. Swap test: replace with him/her.
🎬 Whom did Daniel Barnz cast as the lead teacher in Won’t Back Down? — He cast her (Maggie Gyllenhaal).
🎬 Kurt Russell, whom Gavin O’Connor cast in Miracle, earned praise for his performance as Herb Brooks.
Whom — after a preposition
To, for, with, by, of + whom is the formal pattern.
🎬 Of whom does the group lose track partway through L’Avventura?
When to use which
Use who when…
- It’s the subject of the verb: Who starred in the pivotal donkey role in Au Hasard Balthazar?
- Speaking or writing informally: Who did the studio hire to direct American Factory? (common in everyday speech)
- Introducing a defining clause about the doer: Malik Bendjelloul, who directed Searching for Sugar Man, also edited the film.
Use whom when…
- It’s the object of the verb: Whom did the Academy honour with Best Actor?
- It follows a preposition: The producer to whom Bryan Fogel pitched Icarus greenlit it immediately.
- You’re writing formally: essays, official reviews, awards announcements.
Signal words: your instant clue
A handful of fixed prepositional phrases almost always demand whom — learn these and you’ll spot the pattern instantly.
Whom triggers (right after a preposition)
Who cues (right before a verb)
Visual guide
Teacher Teddy’s illustrated guide to this rule is being drawn — the full swipe-through infographic will appear here soon.
Common mistakes
❌ Whom directed Blackfish?
✅ Who directed Blackfish?
Swap test: “She directed it” (Gabriela Cowperthwaite) — subject, so it needs who.
❌ To who did the festival award the top prize for An Inconvenient Truth?
✅ To whom did the festival award the top prize for An Inconvenient Truth?
Directly after a preposition (“to”), formal English always takes whom.
❌ Whom starred alongside Billy Bob Thornton in Friday Night Lights?
✅ Who starred alongside Billy Bob Thornton in Friday Night Lights?
Swap test: “He starred alongside him” (Lucas Black) — subject, so it needs who.
❌ I don’t know who to thank for this Oscar nomination.
✅ I don’t know whom to thank for this Oscar nomination.
The person is the object of “thank”, so formal English wants whom — though “who” is common and accepted in speech.
British vs American note: in casual spoken English on both sides of the Atlantic, “who” is steadily replacing “whom” almost everywhere except directly after a preposition. Formal writing — essays, journalism, awards announcements — still expects the traditional rule above.
Exceptions & tricky cases
1. Ignore inserted clauses like “do you think”. Phrases such as “do you think”, “do you suppose” or “do you reckon” sit in the middle of the sentence but don’t change the case — look at the verb the pronoun actually belongs to.
✅ Who do you think will win Best Actor this year? (who is the subject of “will win”, not the object of “think”)
2. Whoever and whomever follow the same rule. Look only at the role inside its own clause — ignore the preposition in front of the whole clause.
✅ The studio will cast whoever auditions best for the role. (subject of “auditions”) ✅ The award goes to whomever the judges choose. (object of “choose”)
3. “Whom” can disappear entirely in relative clauses. In a defining relative clause, the object pronoun is often dropped altogether — especially in speech.
✅ The activist (whom) Louie Psihoyos filmed for The Cove had never appeared on camera before.
4. “Whom” is fading fast outside formal writing. Even careful speakers now often say “Who did you give the Oscar to?” instead of “To whom did you give the Oscar?” — both are understood, but only the second is fully formal.
Practice: pick the right word
Eight quick questions. Pick the answer you’d actually write — you get the explanation either way.
1. ___ directed Your Name?
“He directed it” (Makoto Shinkai) — subject → who.
2. To ___ did the Academy award Best Documentary for O.J.: Made in America?
Right after the preposition “to” → whom.
3. ___ do you think will win Best Actor this year?
Subject of “will win” — “do you think” is just inserted → who.
4. ___ did Naoko Yamada cast as the lead in A Silent Voice?
“He cast him” (Miyu Irino) — object of “cast” → whom.
5. The director ___ has won the most Best Director Oscars is John Ford, with four.
“He has won” — subject of “has won” → who.
6. With ___ did Kotaro Daigo share the screen in Weathering with You?
Right after the preposition “with” → whom.
7. I don’t know ___ to thank for this Oscar nomination.
Object of “thank” in formal English → whom.
8. Give the award to ___ deserves it most.
Subject of “deserves” inside its own clause → whoever.
Keep going
Related lessons in Commonly Confused Words:
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