Who vs Whom: The Easy Rule, Examples and the He/Him Test

Few grammar choices cause as much doubt as who vs whom. Many writers skip whom completely. That works in casual speech, but formal writing still expects the right form. This guide gives you one clear rule, a simple test and plenty of examples.

Who vs Whom at a Glance

	Who	Whom
Grammar job	Subject pronoun	Object pronoun
Replace it with	he, she, they	him, her, them
Refers to	The person doing the action	The person receiving the action
After a preposition?	Rarely	Yes: to whom, with whom, for whom
Example	Who called you?	Whom did you call?
Tone	Neutral	Formal

The table shows the pattern in one glance. Now let us look at each word more closely.

When to Use Who

Who is a subject pronoun. It works like he, she, I, we or they. The person it names does the action of the verb.

• Who baked the bread? (She baked it.)
• Who is calling? (He is calling.)
• The woman who lives next door is a nurse. (She lives next door.)

In each sentence, who sits right before the verb it controls. That is a quick clue. If the word comes straight before a verb and does that action, who is almost always correct.

When to Use Whom

Whom is an object pronoun. It works like him, her, me, us or them. The person it names receives the action, or follows a preposition.

• Whom should I call? (I should call him.)
• Martin, with whom I work, just got promoted. (I work with him.)
• To whom should I speak? (I should speak to her.)

Notice that whom often comes before a different subject, such as I. The verb has its own doer, so whom cannot be the subject.

The He/Him Test

This is the most reliable trick, and Grammarly, Scribbr and QuillBot all teach a version of it. Follow these steps.

1. Find the clause that holds the word.
2. Turn it into a statement, even if you need to reorder it.
3. Replace who or whom with he or him.
4. If he sounds right, use who. If him sounds right, use whom.

Try it on this question: “Who/Whom did the committee choose?”

• Reorder it: The committee chose ___.
• Test it: The committee chose him. (Not “chose he.”)
• Answer: Whom did the committee choose?

Now try this one: “Who/Whom wrote the report?”

• Test it: He wrote the report. (Not “him wrote.”)
• Answer: Who wrote the report?

Who vs Whom After a Preposition

A preposition is a word like to, for, with, by or from. The word right after it is its object. So whom is the preferred choice.

• To whom did you give the keys?
• She is the colleague from whom I learned the most.
• By whom was the letter written?

Merriam-Webster confirms that whom is the preferred form after a preposition. There is one exception. When the whole clause follows the preposition, the clause needs its own subject.

• We argued about who would drive. (Who is the subject of “would drive.”)
• She is interested in who will win. (Who is the subject of “will win.”)

In both examples, the preposition’s object is the full clause. Inside that clause, who does the action.

Who vs Whom in Questions

Questions are where most people get stuck. The word order hides the role of the pronoun. Turn the question into a statement first.

• Question: Whom did Lulu invite?
• Statement: Lulu invited her. (Her points to whom.)

Formal English puts the preposition first: “To whom should I send this?” Everyday speech moves it to the end: “Who should I send this to?” QuillBot notes that the second version is more natural in conversation.

Ending a sentence with a preposition is grammatically acceptable. Merriam-Webster says so directly. You can choose the version that fits your audience.

Tricky Sentences With Two Verbs

Long sentences can hide the real role of the pronoun. Look at this example.

• The man who I thought was the villain turned out to be the hero.

It feels like “I thought him.” But the word actually belongs to a second verb. Drop the phrase “I thought.” The clause then reads “the man who was the villain.” He was the villain, so who is correct.

A similar case uses commas.

• The plumber, who you said was coming, never arrived.

Again, who is the subject of “was coming.” Ignore “you said” and the answer is clear. A wrong version looks like this: “The man, whom I thought was a doctor.” Whom is wrong because the word acts as the subject.

Essential clauses take no commas. “The student who won the prize is my cousin” needs no commas. Extra information does need them: “My cousin, who won the prize, lives in Dallas.”

Whoever vs Whomever

These two follow the same logic. Whoever is a subject. Whomever is an object.

• Give the tickets to whoever arrives first. (He arrives first.)
• Invite whomever you like. (You like them.)

The first example surprises people. Because the word follows “to,” it seems to need whomever. But the whole clause “whoever arrives first” is the object of “to.” Inside that clause, whoever is the subject of “arrives.” Check the clause’s own verb, not the preposition.

Whosoever and whomsoever are older forms. Today they appear mostly in legal writing.

Should You Still Use Whom?

It depends on your audience. Whom is formal. In emails, chats and speech, who is standard, even where whom is technically correct. Using who in casual writing is rarely a mistake anyone notices.

Formal and academic writing is different. Essays, reports, legal documents and cover letters expect the correct form. Editors will usually fix it.

One fixed phrase deserves a note. “To Whom It May Concern” is the standard opening for a formal letter to an unknown reader. “To Who It May Concern” is never correct.

Why English Has Both Words

The split goes back many centuries. Whom comes from the Middle English word hwām, the dative form of who. Speakers used it for indirect objects and after prepositions. A separate form handled direct objects.

Over time, English dropped most case endings on nouns. The pronoun system simplified too. Researchers at the University of Surrey describe how the older forms merged. Who has slowly replaced whom in everyday speech. Today whom survives mostly in formal English and in fixed phrases. For many speakers it now signals formality more than grammar.

Common Mistakes With Who and Whom

Incorrect	Correct	Why
Whom is at the door?	Who is at the door?	Who is the subject of “is”
Who did you give it to? (formal)	To whom did you give it?	Whom is the object of “to”
To who it may concern	To whom it may concern	Fixed formal phrase
The man whom I thought was a doctor	The man who I thought was a doctor	Who is the subject of “was”
Whomever arrives first	Whoever arrives first	Whoever is the subject of “arrives”
For who is this gift?	For whom is this gift?	Whom follows “for”

Overcorrection is the most common error. Writers add whom to sound polished, then use it for a subject. When unsure, the he/him test fixes it fast.

Who vs Whom Quick Practice

Fill in each blank, then check the answers below.

1. ___ left the window open?
2. The coach ___ the players trust retired.
3. With ___ did you travel?
4. Pick ___ you prefer.
5. She is the one ___ I believe won.

Answers: 1. Who (he left). 2. whom (the players trust him). 3. whom (with him). 4. whomever (you prefer them). 5. who (she won, so “I believe” is only a side phrase).

Frequently Asked Questions