Who or Whom Grammar? | Rules That Make Choice Easy

If you pause every time you reach a sentence with who or whom, you are not alone. English learners meet this choice in essays, emails, and exams, and many native speakers still feel unsure about it.

Course titles and test instructions often use this wording, so mastery of the pattern helps with real exam tasks for learners everywhere.

This page collects the main rules in one place so you can revise them again during study.

Who or Whom Grammar? Common Questions From Learners

The short version goes like this: who works as a subject pronoun, while whom works as an object pronoun. That means who is linked to the doer of the action, and whom is linked to the receiver of the action or to a preposition.

Still, real sentences can feel messy. Questions, relative clauses, and formal writing all add extra choices. Before the detailed rules, here is a quick snapshot of the main patterns.

Sentence Pattern	Use “who” When	Use “whom” When
Simple statement	Pronoun is the subject: Who wrote this?	Pronoun is the object: Whom did you call?
Question with helper verb	Answer would be he, she, they: Who are they?	Answer would be him, her, them: Whom did you invite?
After a preposition	Informal speech where whom feels too formal	Formal style: To whom did you speak?
Relative clause	Pronoun is subject of the clause: the student who passed	Pronoun is object in the clause: the student whom I taught
Everyday conversation	Who almost everywhere: Who are you talking to?	Whom mainly after prepositions in formal contexts
Formal writing	Subject position: the applicant who meets the criteria	Clear object or preposition object: the applicant to whom we wrote
Exams and graded work	Subject role in a clause or question	Object role, especially where teachers expect traditional rules

Rules For Who And Whom In Simple Terms

The standard rule from school grammars says that who is a subjective pronoun and whom is an objective pronoun. In practice that means you match who with pronouns like he, she, and they, and you match whom with pronouns like him, her, and them.

One fast test works in many cases. Try to answer the question or rewrite the clause with another pronoun. If the answer naturally takes he, she, or they, use who. If the answer naturally takes him, her, or them, use whom.

Subject Role: When “Who” Fits

Use who when the pronoun acts as the subject of the verb. The subject carries out the action in the sentence.

Study these patterns:

• Who wants extra practice? (who = subject of wants)
• Who made this mistake? (who = subject of made)
• The player who scored the goal celebrated. (who = subject of scored in the relative clause)

In each case, you could swap who for he, she, or they without changing the grammar of the sentence, which confirms that who is correct.

Object Role: When “Whom” Fits

Use whom when the pronoun acts as the object of a verb or preposition. The object receives the action or comes after a preposition such as to, for, with, or about.

Study these examples:

• Whom did you see? (whom = object of see)
• To whom should I send this email? (whom = object of the preposition to)
• The colleague with whom I worked left last year. (whom = object of with inside the relative clause)

Here, you could answer with him, her, or them. That match signals that whom is grammatically correct.

Informal English And The Drift Toward “Who”

Modern usage guides from sources such as Merriam-Webster on who versus whom explain that whom is disappearing in daily speech, except in the most formal settings or fixed phrases.

For academic essays, exams, and professional documents, though, teachers and editors may still expect you to follow the traditional split between who and whom, especially after prepositions or in strictly formal relative clauses.

How To Test Sentences With Who Or Whom

When you meet a tricky sentence, slow it down and apply a step sequence. This helps you decide between who and whom in a calm, mechanical way.

Step 1: Is The Pronoun A Subject Or Object?

Strip the sentence to its core and see what the pronoun is doing. Try to place the pronoun right before the verb that belongs to it.

• Who/whom do you think will win? Rewrite as: You think who will win. Here, who is the subject of will win, so who is correct.
• Who/whom do you think they will choose? Rewrite as: You think they will choose whom. Here, whom is the object of choose, so whom fits.

Step 2: Try The He/Him Test

Replace the whole who or whom phrase with he or him, she or her, they or them. Then pick who for he, she, they and whom for him, her, them.

• (He/ Him) is responsible for the project. You would say he, so the correct form is Who is responsible for the project?
• You spoke to (he/ him) yesterday. You would say him, so the question becomes To whom did you speak yesterday? in formal style.

Step 3: Watch Prepositions And Relative Clauses

After prepositions such as to, for, with, and about, traditional grammar favours whom. In relative clauses, the same subject–object rule applies, but the pronoun sits in the middle of the sentence.

• The student to whom you gave feedback improved.
• The student who improved thanked you later.

The first clause has whom as the object of the preposition to. The second clause has who as the subject of improved.

Who Or Whom In Questions And Relative Clauses

Questions and relative clauses create many classic test items. Once you see the structure beneath them though, the choice becomes far easier.

Direct Questions With Who Or Whom

In direct questions, the main verb often sits far from the pronoun, which hides the real subject–object pair. Bringing the sentence back to statement order reveals the pattern.

• Who is at the door? → Statement: He is at the door. So who is correct.
• Whom did you meet at the workshop? → Statement: You met him at the workshop. So whom fits.
• Who are you waiting for? → Statement: You are waiting for him. Formal writers might choose For whom are you waiting? but who is normal in speech.

Relative Clauses With Who Or Whom

Relative clauses attach extra information to a noun. Guides such as the Cambridge page on who and whom show that whom appears mostly in formal writing, especially after prepositions, while who often fills both subject and object roles in many everyday sentences.

• The scientist who designed the experiment won an award. (who = subject of designed)
• The scientist whom the committee praised received funding. (whom = object of praised)
• The scientist who the committee praised received funding. (who used as object in less formal style)

Practical Patterns To Remember For Exams

Exams, style guides, and academic rubrics tend to favour clear splits between who for subjects and whom for objects. That means teachers often expect whom after prepositions and in places where the object comes at the start of a clause.

For timed tests you can rely on a small set of safe patterns. These patterns follow traditional rules and keep teachers happy even if spoken English now relaxes some of them.

Pattern	Example Sentence	Choice And Reason
After a preposition	To whom should the letter be sent?	Whom as object of the preposition to
Object before subject	Whom did the manager recommend?	Whom as object of recommend
Subject of a verb	Who completed the assignment?	Who as subject of completed
Relative clause, subject	The candidate who arrived early waited outside.	Who as subject of arrived
Relative clause, object	The candidate whom we interviewed was prepared.	Whom as object of interviewed
Formal phrase	For whom it may concern	Fixed expression with whom
Informal question	Who are you sharing a room with?	Who common in speech even after a preposition

Who or Whom In Real Writing

So far, the focus has been on sentence level rules. Real writing, though, ranges from text messages to research articles. You can adjust your use of who and whom depending on the context and audience.

Casual Messages And Everyday Conversation

In text messages, chats, and quick emails among friends, almost nobody uses whom, except in fixed expressions or jokes. Sentences such as Who are you going with? sound natural and clear.

If you slip whom into casual speech, it can sound stiff or old-fashioned. For most informal contexts, use who everywhere and keep your attention on clarity and tone instead of perfect case marking.

Academic And Professional Writing

In essays, reports, and formal letters, precise grammar helps your message stay clear. Markers and hiring managers may not comment when you use who in place of whom, yet some readers still notice the difference, especially after prepositions.

When you write at this level, favour whom as the object of verbs and prepositions in places where the sentence structure makes the role clear. Phrases such as To whom it may concern or Applicants whom the panel selects match traditional expectations and read well in formal documents.

Balancing Rules And Natural Style

Worrying too much about who and whom can interrupt your writing flow. A practical approach is to draft with who everywhere, then adjust only the most visible formal positions during revision.

Quick Reference Summary For Who or Whom Grammar?

To finish, here is a short checklist you can keep beside your notebook when you practise who or whom grammar.

• Use who when the pronoun is the subject of a verb.
• Use whom when the pronoun is the object of a verb or preposition.
• Test tricky cases by swapping in he/him, she/her, or they/them.
• In informal speech and casual writing, who often replaces whom.
• In exams, essays, and formal letters, follow the traditional subject–object split, especially after prepositions and in relative clauses.

With practice, you will start to feel which form fits.

When you read exam papers or grammar books, you will meet the question who or whom grammar? again and again, and each time it will feel easier.

You will pause less, write faster, and still keep teachers, editors, and careful readers satisfied.