“Who is bringing the books?” and “Whom should I thank?” sound as though they belong to two different centuries. But they ask a familiar question: who performed an action, and who received one? Did you know that the choice becomes easier when you identify the person’s grammatical job before deciding how formal the sentence needs to sound?
Who is the normal subject form for asking which person performs an action: “Who called?” Whom is the traditional object form, most often used in formal English: “Whom did the organiser invite?” In ordinary contemporary conversation, who also frequently appears in object position: “Who did you invite?” The core aim of mastering who versus whom is to keep clear which person is acting and which person or recipient is involved, while choosing a register that suits the audience.
This article answers who vs whom rules, who vs whom examples, who or whom after a preposition, and who vs whom exercises with answers. Cambridge Grammar confirms that whom is the object form and is much less common in ordinary speech than in formal writing. See Cambridge’s Who, Whom reference and the related Direct and Indirect Questions guide. The purpose here is clarity and choice, not correcting natural conversation into artificial formality.
Find the actor and the receiver first
“Alicia invited Tricia.” Alicia is doing the inviting; Tricia receives the invitation. Ask about the actor and we get “Who invited Tricia?” Ask about the person invited and a formal version is “Whom did Alicia invite?” In ordinary speech, “Who did Alicia invite?” is completely natural.
Students often try to decide from the first word alone, but a question can move that word far from its underlying grammatical position. The important relationship lies inside the clause: who does something, and whom does somebody act upon? Once that is clear, the writer can select a natural subject or object form.
A simple test with he and him — useful but not magical
For a straightforward clause, imagine an answer. If “he called”, the question naturally begins with who. If “Alicia called him”, then formal object whom is possible. It is a useful shortcut because he and him show the subject–object distinction more visibly.
- “Who found the key?” → “He found the key.”
- “Whom did you meet?” → “I met him.” (Formal wording.)
- “Who should lead?” → “She should lead.”
- “Whom did the group choose?” → “The group chose her.” (Formal wording.)
The shortcut needs the right clause. With an embedded sentence or a longer question, simply testing the person against the nearest verb can lead to the wrong answer. Identify the verb that the interrogative pronoun actually belongs to, then test its role.
Why modern English often uses who where traditional grammar allows whom
“Who did you speak to?” is ordinary conversational English and is not automatically a mistake. “Whom did you speak to?” is more formal, and “To whom did you speak?” is more formal still. Cambridge describes object whom as uncommon in everyday speech and especially common after prepositions in formal writing.
The goal is not to tell learners they must say whom every time a person is the object. A friendly message can naturally ask “Who are you meeting?” A formal report may prefer “The colleagues whom we interviewed”, depending on house style, but “the colleagues who we interviewed” is also normal in many contexts.
English mastery includes recognising register: the same grammatical relationship can be expressed with different levels of formality, without changing who acted upon whom. Overformal language can be as distracting as careless wording.
After a preposition: where whom most clearly earns its place
“To whom should the form be sent?” uses whom as the object of to. “With whom will you travel?” is another formal construction. The corresponding everyday questions are “Who should I send the form to?” and “Who will you travel with?” Both structures can be grammatical; they differ in register and sometimes in the way they frame the message.
Phrasing such as “the person to whom the letter was addressed” may suit formal correspondence. “The person the letter was addressed to” may be simpler and more natural in an ordinary explanation. A student should identify the actual preposition and its object before assuming that every nearby who needs to change to whom.
The tricky question: Who do you think will win?
Look at “Who do you think will win?” The person is the subject of will win, even though do you think appears between the question word and the important verb. Formal whom is not required simply because the first word appears near the verb think. The winner is the one doing the winning.
Now contrast “Whom do you think the judges will choose?” In a deliberately formal style, whom can function as the object of choose; in everyday speech, “Who do you think the judges will choose?” is natural. The two questions look similar on the surface, but the missing person occupies a different grammatical role in the embedded clause.
This is where the he/him test must be applied carefully. The natural answers are “She will win” and “The judges will choose her”, not a replacement based on whichever verb stands closest to the question word.
Who and whom in relative clauses
“The learner who completed the experiment explained the result.” Here the relative pronoun is the subject of completed. “The learner whom the tutor praised smiled” uses a formal object relative pronoun; “The learner who the tutor praised smiled” is common in less formal writing. In a defining relative clause, the object pronoun can often be omitted altogether: “The learner the tutor praised smiled.”
Cambridge’s relative pronouns reference explains that who is common in subject and object relative clauses while whom occurs in formal object uses, often after prepositions. For the distinction between defining and non-defining information, visit the separate Relative Clauses guide.
Who, whom, whose and who’s are four different jobs
- Who asks or refers to a person, commonly as a subject and often as an object in everyday English.
- Whom is the formal object form for a person.
- Whose expresses possession or association: “Whose notebook is this?”
- Who’s is a contraction of who is or who has: “Who’s finished the worksheet?”
A student who writes “Who’s folder is missing?” needs the possessive whose, not a lesson only on subject-versus-object forms. Ask them to expand who’s to who is or who has. If the expanded sentence fails, check the possessive form. The broader contraction lesson is Apostrophes and Possessives.
The fixed formal phrase: To whom it may concern
Some expressions are learnt naturally as complete phrases. “To whom it may concern” is a conventional formal opening used when the specific recipient is not known. It is not usually improved by changing it to “To who it may concern” merely because everyday conversation prefers who in many object questions.
That does not mean the phrase belongs in every letter. A message to a known parent, teacher or colleague is usually clearer with the correct recipient’s name or role. The function of formality is to serve the audience, not to give every message the tone of a legal notice.
Avoid hypercorrection: whom is not a badge of sophistication
“Whom is speaking?” is not the ordinary formal subject question; use “Who is speaking?” The subject role still matters. “Whom do you think is ready?” is often a hypercorrection if the intended person is the subject of is ready; “Who do you think is ready?” is appropriate.
Equally, insisting that “Who did you invite?” is universally wrong would misrepresent contemporary usage. Teach the subject–object distinction and explain when formal whom is available. Accurate register is more valuable than applying an old rule without listening to how English is used.
A five-question decision guide
- Identify the person the question or relative clause refers to.
- Find the actual clause and verb in which that person has a role.
- Decide whether the person performs the action (subject) or receives it / follows a preposition (object).
- Choose who for a subject. For an object, decide whether natural everyday who or formal whom fits the audience.
- Read the whole sentence: does the wording make the actor, receiver and intended tone clear?
This method prevents a learner from overusing whom whenever a sentence looks long. A teacher can mark the relevant subject and verb on the page and ask the student to identify the missing role before considering style.
Who vs whom exercises with answers
Choose a natural or formal form as requested. These are original practice questions with context, not an examination answer key that bans acceptable modern alternatives.
- Subject of the verb: “(Who / Whom) prepared the experiment?”
- Formal object question: “(Who / Whom) did the tutor invite?”
- Normal conversation: “(Who / Whom) are you waiting for?” Choose the natural everyday form.
- Formal preposition: “To (who / whom) was the letter addressed?”
- Embedded subject: “(Who / Whom) do you think will lead the team?”
- Embedded object, formal style: “(Who / Whom) do you think they nominated?”
- Subject relative clause: “The student (who / whom) found the book returned it.”
- Formal object relative: “The teacher (who / whom) the students thanked was delighted.”
- Possession: “(Whose / Who’s) pencil is this?”
- Contraction: “(Whose / Who’s) going to collect the papers?”
Suggested answers: (1) Who; (2) Whom in the requested formal style, with who natural elsewhere; (3) Who; (4) whom; (5) Who, subject of will lead; (6) Whom in formal style, object of nominated; (7) who; (8) whom in formal style, though who or omission is natural in many contexts; (9) Whose; (10) Who’s, meaning who is. The task distinguishes grammar roles from register choices.
A 3-pax lesson that makes subject and object visible
Give three students cards for actor, action and recipient. One student builds a sentence such as “Alicia thanked Ben”. A second forms a question about the actor. A third forms one about the recipient. Then change the sentence into a relative clause and compare the natural and formal versions. Every student should explain the role, not merely repeat the pronoun.
In the next session, use a new sentence containing an embedded clause, such as “Who do you think will succeed?” The learner should identify the subject of the embedded verb without being led by word order alone. This tests whether they understand grammatical relationships and can transfer the idea to more demanding prose.
Frequently asked questions
Is whom still correct English?
Yes. Whom remains a standard formal object form, especially after prepositions and in formal writing. It is much less common in ordinary conversation.
Is “Who did you speak to?” grammatically acceptable?
Yes. It is a natural everyday English question. “To whom did you speak?” is a more formal alternative. Register and audience explain the difference.
Why is “Who do you think will win?” not whom?
Because the person referred to is the subject of will win. The intervening phrase do you think does not change that underlying role.
Can I leave who or whom out of a relative clause?
An object relative pronoun in a defining relative clause can often be omitted: “The person I met”. A subject relative pronoun normally cannot be removed in the same construction: “The person who called”.
The core aim: preserve roles without forcing formality
A question succeeds when a reader knows who acts, who receives the action and how formally the writer wants to address the audience. The core aim of who versus whom is clear grammatical relationships and thoughtful register, not the performance of sophistication. The best choice is the one that makes the intended person and sentence function easy to understand.
For reference, read Cambridge Grammar: Who, Whom and Questions and Interrogative Pronouns. Within eduKateSG, continue through Direct and Indirect Questions, Relative Clauses, Pronoun Reference and Antecedents and the English Learning Hub.