Introduction
Let’s be honest: few grammar points stir up as much anxiety as the choice between “who” and “whom.” Even experienced writers sometimes freeze, second-guessing which one belongs in a sentence. The good news? The rule is actually straightforward, and with a simple trick, you can banish the confusion for good. In this guide, we’ll break down the logic, show you a foolproof test, and walk through examples so you can use “who” and “whom” with confidence.
The Simple Rule
At its core, the distinction is about grammatical case:
- Who is used for the subject of a verb (the one doing the action).
- Whom is used for the object of a verb or preposition (the one receiving the action).
If you’re comfortable identifying subjects and objects, you can apply this rule directly. But many people find that approach too abstract. That’s where the “he/him” trick comes in.
The He/Him Trick
Here’s the secret: if you can answer the question with he, use who; if you can answer with him, use whom. Why does this work? Both “who” and “he” are subject pronouns, while “whom” and “him” are object pronouns. The trick removes the need to diagram sentences.
Example:
“(_Who/Whom_) is coming to dinner?”
Answer: He is coming. → “Who is coming to dinner?”
“(_Who/Whom_) should I invite?”
Answer: I should invite him. → “Whom should I invite?”
Notice that in the second example, “invite” is a transitive verb and “whom” is its direct object. The trick makes it obvious.
When to Use Who
Use “who” when the pronoun is the subject of a verb. This includes sentences where the verb follows directly:
- Who wrote this article? (He wrote it.)
- She is the person who called you yesterday. (She called.)
- Let’s find out who broke the vase. (He broke it.)
When to Use Whom
Use “whom” when the pronoun is an object—whether of a verb or a preposition. Here are common situations:
- Whom did you meet at the party? (You met him.)
- The artist whom we admire is visiting soon. (We admire him.)
- To whom it may concern: (the object of the preposition “to”)
- He is the consultant with whom I work. (I work with him.)
In formal writing, prepositions usually come before “whom.” In everyday speech, the preposition often moves to the end: “Who do you work with?” Many linguists accept this, but for formal contexts, keeping the preposition before “whom” is standard.
Common Exceptions and Tricky Cases
Even with the trick, some sentences are confusing because of clauses or inverted word order. Let’s look at a few:
1. Indirect questions
Indirect questions (e.g., “I wonder who is coming”) do not invert subject and verb the way direct questions do. The pronoun’s role is determined within its own clause, not the main sentence.
- I don’t know who he is. (He is the subject of “is”; “he” = subject, so “who”.)
- I don’t know whom he hired. (He hired him; “him” = object, so “whom”.)
2. Sentences with “to be”
The verb “to be” takes a subject complement, not an object. So after forms of “be,” use “who”:
- It is I who am responsible. (Formal; in casual speech, “who’s” is common.)
3. Relative clauses with “that” elision
When “that” is omitted, the pronoun can appear right before the verb, tempting you to use “who” even when it’s an object. Example:
- The man whom I saw was tall. (I saw him.)
- But in speech: The man I saw was tall. (Here “whom” is implied but not written.)
4. Preposition at the end
Informal English often places the preposition at the end, and then “who” tends to replace “whom”:
- Who did you go with? (Standard: With whom did you go?)
Practice Makes Perfect
Test yourself with these sentences. Use the he/him trick for each:
- (Who/Whom) sits next to you? → He sits → Who
- (Who/Whom) are you waiting for? → You are waiting for him → Whom (or “Who” in casual register)
- She is the one (who/whom) won the prize. → She won → who
- We met a guide (who/whom) we really liked. → We liked him → whom
- Tell me (who/whom) you trust. → You trust him → whom
How did you do? If you stumbled on the last one, remember that the pronoun’s role is within the clause “you trust [whom],” not in the main clause.
Conclusion
Mastering “who” vs. “whom” doesn’t require a degree in linguistics. With the he/him trick, you can quickly decide which word fits, whether you’re writing a formal paper, an email, or a novel. While “whom” is becoming less common in casual speech, using it correctly in writing lends an air of precision and care. Practice the trick until it becomes second nature, and you’ll never have to avoid a sentence just because it needs “whom.” Grammar made simple, indeed.
Remember: he = who, him = whom. That’s your golden rule. Now go forth and write with confidence.