Use "who" as the subject of a clause and "whom" as the object. For example, "Who wrote this letter?" uses "who" because the person is doing the action. "To whom did you send the package?" uses "whom" because the person receives the action.
Grammatically, "who" functions as a subject pronoun, while "whom" is an object pronoun. This distinction traces back to Old English and remains consistent in formal written English. Misusing them is common, especially in spoken language where "who" often replaces "whom" even when incorrect.
When in doubt, substitute "he" or "him" into the sentence. If "he" fits, use "who." If "him" fits, use "whom." This test works reliably in most cases. For example: "The teacher praised the student who spoke " - "who" is correct because "the student he spoke " makes sense. But "The teacher praised the student whom she met yesterday" - "whom" is correct because "she met him" is accurate.
"Who" introduces a clause where the person is performing the verb. It acts as the subject. In questions, "who" asks about the doer. In statements, it identifies the subject. For example: "Who called you?" - the caller is the subject.
"Whom" appears when the person is receiving the action. It is the object of a verb or preposition. In formal writing, it follows prepositions like "to," "for," "from," or "about." For example: "To whom should I address this letter?" - "whom" is the object of the preposition "to."
A common error occurs when people omit the preposition. In speech, we often say "Who did you give it to?" instead of "To whom did you give it?" The latter is grammatically correct, though the former is widely accepted in informal contexts. However, in legal documents, academic papers, or formal correspondence, using "whom" correctly is expected.
Many writers confuse "who" and "whom" when the sentence structure is complex. A frequent mistake is placing "whom" after a verb that doesn't take an object. For example: "She is the woman whom sings at the concert" is incorrect. The correct version is "She is the woman who sings at the concert" - "who" is the subject of "sings."
Another error arises when "whom" is used after a preposition that's implied rather than stated. Consider: "The man whom I saw at the store." The preposition "at" is implied but not stated. The rule still applies: "whom" is correct because the man is the object of the implied "saw." But if the sentence were "The man who I saw at the store," both are acceptable in modern usage, though "who" is more common.
Some writers assume "whom" is always more formal or superior. That's not true. It's simply a grammatical role. Using "whom" incorrectly - such as replacing "who" in a subject position - weakens clarity. The goal is accuracy, not formality.
| Usage | Correct Word | Example Sentence | Why It Works |
|---|---|---|---|
| Subject of verb | who | The speaker who delivered the keynote was praised. | "Who" is the subject of "delivered." |
| Object of verb | whom | The guest whom the host invited was late. | "Whom" is the object of "invited." |
| Object of preposition | whom | To whom did you send the invitation? | "Whom" is the object of "to." |
| Informal substitution | who | Who did you see at the party? | Standard spoken English ignores "whom" in casual settings. |
Consider this sentence: "The journalist who interviewed the mayor reported the story." Here, "who" is correct because the journalist is the subject of "interviewed." Replacing it with "whom" creates an error: "The journalist whom interviewed..." - this violates subject-verb agreement.
Now consider: "The mayor, whom the journalist interviewed, gave a press conference." "Whom" is correct here because the mayor is the object of the verb "interviewed." You can verify this by substituting "him": "The journalist interviewed him." The original sentence becomes "The mayor, whom the journalist interviewed..." - which matches.
A non-obvious fact: "whom" is not limited to human subjects. It can refer to animals or things when they are objects. For example: "The dog whom I adopted last week is friendly." While rare, this usage is grammatically valid. More commonly, people say "that" or "which" in such cases, but "whom" is not wrong.
I once edited a grant proposal where the phrase "the researcher whom led the study" appeared. The editor had used "whom" as the subject. After correcting it to "who," the sentence became grammatically sound. This error persists because many people associate "whom" with formality and assume it belongs in every formal sentence, regardless of function.
People often mix up "who" and "whom" with "that" and "which." These are different categories. "That" and "which" are relative pronouns used to introduce clauses about things or groups. "Who" and "whom" refer specifically to people. For example: "The book that I read was long" - "that" refers to "book." "The person who helped me" - "who" refers to "person."
Another confusion is thinking "whom" is obsolete. It isn't. It's still used in formal writing, legal texts, and academic journals. According to the Chicago Manual of Style, "whom" remains standard in formal English despite declining use in everyday speech. The Associated Press Stylebook acknowledges the decline but recommends preserving "whom" in formal contexts.
Even in modern literature, "whom" appears in precise roles. In Toni Morrison's *Beloved*, the sentence "He was the man whom she loved" uses "whom" correctly. The word is not archaic - it's functional. Its reduced frequency in conversation doesn't make it invalid.
Suppose you're writing: "The committee members who reviewed the report submitted their findings." This is correct. "Who" is the subject of "reviewed."
Now change the sentence to: "The committee members whom the chairperson consulted agreed on the outcome." "Whom" is correct here because the members are the object of "consulted." Try substituting "him": "The chairperson consulted him." That confirms "whom" is appropriate.
If you're unsure, rewrite the clause with a pronoun. Ask: "Did the chairperson consult he?" No - "did the chairperson consult him?" So "whom" is correct.
Mastering "whom vs who examples" improves clarity in writing. Use "who" for subjects, "whom" for objects. Test with "he/him" substitutions. Avoid assuming formality equals correctness. Accuracy, not flair, defines good grammar.