who (whom)

Use who when the pronoun is the subject (it does the action). Use whom when the pronoun is the object (it receives the action or follows a preposition). Quick tests: the he/him swap and checking prepositions.

Below: fast rules, short tests, many real-world examples (work, school, casual), six wrong→right pairs you can copy, three quick rewrites to avoid whom, and a checklist to check your sentences in seconds.

Quick answer: subject = who; object = whom

If the pronoun performs the action, use who. If it receives the action or follows a preposition, use whom. Fast test: swap in he/him (or she/her). If him/her fits, use whom; if he/she fits, use who.

Subject: He wrote the report → Who wrote the report?
Object: You emailed him → Whom did you email?
Preposition: To whom, with whom, for whom in formal writing; trailing prepositions are fine in informal contexts.

Core explanation: subject vs object

Who = subject (the doer). Whom = object (the receiver or object of a preposition). Convert the clause to a statement and substitute he/him to check the case quickly.

Who = subject of the verb: "Who called?" → "He called."
Whom = object of verb or preposition: "Whom did you call?" → "You called him."
Common formal prepositions followed by whom: to, for, with, by, about.

Grammar tests you can do in 3 seconds

Two fast checks:

He/him swap: Turn the question into a statement and test the pronoun. If him/her fits, use whom; if he/she fits, use who.
Preposition move: In formal writing, move the preposition to the front ("To whom..."); in casual writing, a trailing preposition is fine ("Who did you send it to?").

Swap-test example: "Who/Whom did you nominate?" → "I nominated him." → use whom: "Whom did you nominate?"
Preposition-fronting example: "Who should I send the report to?" → Formal: "To whom should I send the report?"
Predicative note: traditional grammar favors "It was she who..." but modern usage often relaxes the case in speech.

Real usage: short templates for work, school, and casual speech

Tone matters. Use whom more in formal memos, admissions, or legal writing. In conversation, who usually works.

Work (prefer formal in official docs):
- To whom should I send the signed contract? (formal)
- Whom did you add to the guest list? → Who did you add to the guest list? (email)
- Whom did you ask for the data? (object usage)
School (professors may prefer formal tone):
- Whom did the professor recommend for the assistantship?
- Who solved problem 3 on the exam? (subject)
- Students whom the committee selected will be notified. (formal)
Casual (speech and chat):
- Who's coming to the movie tonight?
- Who did you text last night? (object in speech)
- Who wants coffee? (subject)

Examples: common wrong → right pairs you can copy

Wrong (or informal) first, corrected formal/standard version second. Choose based on audience.

Wrong: Who did you give the report to? →
Right: To whom did you give the report?
Wrong: Who did the manager praise? →
Right: Whom did the manager praise?
Wrong: Who should I notify about the meeting? →
Right: Whom should I notify about the meeting?
Wrong: Who did the professor recommend? →
Right: Whom did the professor recommend?
Wrong: Who did you invite to the panel? →
Right: Whom did you invite to the panel?
Wrong: Who did you cc on the email? →
Right: Whom did you cc on the email?

Try your own sentence

Test the whole sentence, not just a phrase. Convert it to a statement and use he/him to decide. Context usually makes the answer clear.

Rewrite help: quick edits that avoid whom altogether

When whom sounds stilted, rewrite. These fixes work well in emails and student writing.

Make the person the subject: "Whom did you invite?" → "Who did you invite?" or "Which people did you invite?"
Use a noun phrase: "Whom did the committee select?" → "Which candidate did the committee select?"
Change voice: "Whom should I notify?" → "Who should be notified?"

Three quick rewrite examples:

"To whom should I address the letter?" → "Who should I address the letter to?" or "Which official should receive this letter?"
"Whom did you consult about the budget?" → "Who consulted the budget?" (if meaning shifts) or "Which advisor did you consult about the budget?"
"Whom should I contact for access?" → "Who should I contact for access?" or "Which person handles access?"

Fix your own sentence: short checklist + try-it examples

Checklist: 1) Find the clause containing who/whom. 2) Convert to a statement and test he/him. 3) Check preposition placement for formality. 4) If it still sounds awkward, rewrite.

Locate the clause → Do the he/him swap → Decide preposition placement → Rewrite if needed.
When unsure in email: prefer clarity and audience tone over strict whom usage.

Check-example 1: "Who/Whom did you cc on the report?" → "I cc'd her." → use whom: "Whom did you cc on the report?"
Check-example 2: "Who fixed the bug?" → "He fixed the bug." → use who: "Who fixed the bug?"

Memory tricks and quick cues

Two simple cues: He = who (doer). Him = whom (receiver). If a preposition sits directly before the pronoun in formal writing, lean toward whom.

Mnemonic: He → who; Him → whom.
If you can replace with him/her, use whom; otherwise use who.
Edge case: predicative complements ("It was she") follow a related case rule; spoken English often relaxes it.

Mnemonic example: "Who/Whom did you call?" → "You called him." → "Whom did you call?"

Similar mistakes and quick grammar notes (hyphenation & spacing included)

Who/whom confusion belongs to pronoun case. Don't mix it up with relative pronoun choices (who vs that/which) or with subject-verb agreement. Also: no hyphens and no extra spaces before punctuation.

People vs things: use who for people; that/which for things (The person who called; the book that fell).
I vs me: similar case rule-use I as subject, me as object (She and I vs She and me).
Formatting: don't add hyphens or extra spaces with who/whom; write "To whom did you send it?" not "To whom did you send it ?"

Confusion example: Wrong: "The box who arrived is damaged." →
Right: "The box that arrived is damaged."

FAQ

Is it acceptable to use who instead of whom in casual writing and speech?

Yes. In informal contexts, who commonly replaces whom and is widely accepted. Reserve whom for formal documents or when you want a traditional tone.

How can I choose between a formal 'to whom' and a more natural trailing preposition?

"To whom" is better for legal or very formal writing. In emails and conversational writing, a trailing preposition often sounds more natural and friendly.

Will using who where whom is traditionally correct make my writing wrong?

In many professional and casual settings, it will be acceptable. For academic or legal work, prefer whom when the object form is correct.

What quick rewrite should I use if whom sounds awkward?

Make the person the subject, use a noun phrase, or change the verb to a passive form. Example: "Whom should I send this to?" → "Who should receive this?" or "Which colleague should receive this?"

How do I practice and internalize the rule?

When proofreading, run the he/him swap for any who/whom. Keep a short list of common formal patterns (to whom, with whom, whom I contacted) and reuse the rewrite templates above.

Quick habit before you send

Before sending an email or submitting a draft, run the he/him swap or try one quick rewrite from this page. A brief check saves awkward corrections later.

If you don't want to decide every time, keep two templates: one formal ("To whom...") and one natural ("Who..."), and pick by audience.