Who vs Whom: Which One Is Correct?

Who vs whom is a common grammar comparison that confuses many English learners, writers, and even native speakers. Although both words refer to people, they serve different grammatical purposes in a sentence.

Understanding the difference between who and whom can help you write clearer sentences, ask better questions, and communicate more confidently in everyday conversations.

Comparison Overview

Who and whom are both pronouns used to refer to people, but they have different roles in a sentence. The main difference is that who functions as a subject pronoun, while whom functions as an object pronoun.

Use who when referring to the person performing an action. Use whom when referring to the person receiving an action or following certain prepositions, such as to, with, for, and by.

Consider these examples:

• Who called you last night? (The person performing the action of calling.)
• Whom did you call last night? (The person receiving the call.)

In everyday conversation, many English speakers use who instead of whom, especially in informal questions. However, understanding both forms is useful for formal writing, academic work, professional communication, and grammar tests.

Definition of Who

Who is an interrogative or relative pronoun used to refer to a person or people acting as the subject of a sentence or clause. It identifies the person performing an action or the person being described as the subject.

Meaning and Purpose of Who

The word who helps us ask questions about a person’s identity or introduce information about someone.

For example:

• Who is knocking at the door?
• Who prepared this report?
• She is the teacher who helped me.
• I know who organized the event.
• Who wants to join our team?

In each example, who functions as the subject of a question or clause. It identifies the person responsible for an action or situation.

When Who Is Commonly Used

Use who in questions, indirect questions, and relative clauses when it serves as the subject.

Examples:

• Education: Who teaches your English class?
• Daily life: Who left the lights on?
• Business: Who approved the proposal?
• Technology: Who developed this application?
• Science: Who discovered this scientific principle?

The easiest way to recognize who is to look for the person performing the action.

Definition of Whom

Whom is an interrogative or relative pronoun used to refer to a person who functions as the object of a verb or preposition. It identifies the person receiving an action or the person connected to a preposition.

Meaning and Purpose of Whom

The word whom helps us ask questions about the person affected by an action or identify someone who has a particular relationship with another word in a sentence.

For example:

• Whom did you invite to the party?
• To whom should I send this email?
• Whom did the manager select?
• The student whom I helped passed the exam.
• With whom are you traveling?

In these sentences, whom functions as an object rather than the subject performing the main action.

When Whom Is Commonly Used

Use whom in formal questions, relative clauses, and constructions involving prepositions when it functions as an object.

Examples:

• Education: Whom did the teacher choose for the competition?
• Daily life: Whom did you meet at the store?
• Business: To whom should we address the invoice?
• Technology: Whom did you contact about the software issue?
• Science: Whom did the research team interview?

Although whom is grammatically correct in these examples, informal English speakers often use who in similar questions.

Main Differences Between Who and Whom

The main difference between who and whom is their grammatical function. Both words refer to people, but they are not interchangeable in every sentence.

Who vs Whom Comparison Table

Feature	Who	Whom
Grammatical role	Subject pronoun	Object pronoun
Main purpose	Identifies the person performing an action	Identifies the person receiving an action
Used with	Subject of a verb	Object of a verb or preposition
Question example	Who called you?	Whom did you call?
Preposition example	Who is coming?	To whom did you speak?
Formal writing	Commonly used	Often preferred for objects
Informal conversation	Very common	Less common
Replacement test	He, she, or they	Him, her, or them

Difference in Grammatical Function

Who acts as the subject of a verb.

Example: Who wrote this article?

Here, who performs the action of writing.

Whom acts as the object of a verb.

Example: Whom did you help?

Here, the person represented by whom receives the action of helping.

Difference in Sentence Structure

The position of a word alone does not determine whether you should use who or whom. Its grammatical role matters more.

Compare:

• Who did the work? (Who performed the work?)
• Whom did the work impress? (Whom received the impression?)

The first sentence asks about the person doing the work. The second asks about the person affected by the work.

Difference in Formal and Informal English

Whom is especially common in formal writing and after prepositions. In casual speech, who frequently replaces whom in object questions.

Formal: To whom did you give the documents?

Informal: Who did you give the documents to?

Both are widely understood, but the first is generally more formal. In standard formal writing, use whom when it is the object of the preposition to.

Why Do Who and Whom Confuse English Learners?

The confusion occurs because English has gradually simplified many pronoun distinctions in everyday speech. Unlike some languages, modern English does not always mark grammatical roles through changes to nouns. Instead, the role often becomes clear from sentence structure.

Three common reasons for confusion are:

• Similar meanings: Both words refer to people, so their meanings seem almost identical.
• Different grammatical roles: Learners may focus on the person being discussed rather than whether that person is the subject or object.
• Everyday speech: People often use who in situations where traditional formal grammar calls for whom.

For example, many people naturally say, “Who are you talking to?” However, in formal English, “To whom are you talking?” uses the traditional object form correctly.

Understanding the subject-object distinction makes the choice much easier.

Grammar Guide

Who and whom are pronouns, not nouns or verbs. Their grammatical functions determine how they should be used in questions, statements, and relative clauses.

How Each Term Is Used in Sentences

Using Who as a Subject Pronoun

Use who when the person performs the action of the verb.

Common patterns include:

• Who + verb: Who called?
• Who + helping verb + main verb: Who has finished?
• Noun + who + verb: The woman who lives here is a doctor.
• Indirect question + who + verb: I wonder who sent the message.

Examples:

• Who understands this rule?
• Who has completed the assignment?
• The employee who manages the department is on vacation.
• I know who designed the website.

Using Whom as an Object Pronoun

Use whom when the person receives the action of a verb or follows a preposition.

Common patterns include:

• Whom + helping verb + subject + verb: Whom did you invite?
• Preposition + whom: With whom are you working?
• Noun + whom + subject + verb: The person whom we interviewed was qualified.
• Indirect question + whom + subject + verb: I know whom she invited.

Examples:

• Whom did the coach select?
• For whom is this package intended?
• The client whom we contacted responded quickly.
• She knows whom the committee selected.

Using Who and Whom in Indirect Questions

Indirect questions often confuse learners because they follow normal statement word order rather than direct-question word order.

Direct question: Who called you?

Indirect question: I know who called you.

Direct question: Whom did you call?

Indirect question: I know whom you called.

Notice that the indirect question does not use the inverted word order of a direct question.

Common Mistakes Learners Make

Using Who Instead of Whom in Formal Writing

Incorrect in traditional formal grammar: Whom called you?

Correct: Who called you?

The subject of called is the person being asked about, so who is correct.

Using Whom Instead of Who

Incorrect: Whom is responsible for this project?

Correct: Who is responsible for this project?

The pronoun is the subject of is responsible, so use who.

Choosing Based Only on Word Order

Incorrect reasoning: “Whom must be used at the beginning of every question.”

Correct approach: Determine the pronoun’s role, not just its position.

For example, “Who did you say was coming?” is correct because who is the subject of was coming, even though the phrase appears within a larger question.

Forgetting the Preposition

Formal: To whom did you speak?

Informal: Who did you speak to?

Both constructions are commonly used. However, if the preposition comes before the pronoun in formal writing, whom is the standard choice.

Confusing Direct and Indirect Questions

Incorrect: I know whom called the office.

Correct: I know who called the office.

The person calling is the subject, so who is required.

Simple Rules to Remember

Use these easy rules to choose correctly:

1. Use who for the subject. The person performs the action.
2. Use whom for the object. The person receives the action or follows a preposition.
3. Try the he or him test. If he or she fits, choose who. If him or her fits, choose whom.
4. Check the clause containing the pronoun. In longer sentences, the pronoun’s function may depend on a clause rather than the entire sentence.
5. Use whom after a fronted preposition in formal writing. Examples include “to whom,” “with whom,” and “for whom.”

The third rule is often the easiest for beginners to apply.

Quick Tips for Writing and Speaking

• Read the sentence aloud and identify who performs the action.
• Replace the pronoun with he or him to check its role.
• Use whom in formal emails when the pronoun follows a preposition.
• Do not force whom into casual conversations if it sounds unnatural for your audience.
• Review long sentences carefully because the correct choice may depend on a smaller clause.
• When editing academic work, check every instance of who and whom rather than relying on sound alone.

These tips help you maintain grammatical accuracy without making your writing sound unnecessarily complicated.

When to Use Each One

Knowing the right situations for each word makes the distinction easier to apply.

When to Use Who

Use who when referring to the subject of a verb.

In questions

• Who is at the door?
• Who won the award?
• Who will lead the meeting?

In relative clauses

• The student who answered correctly received a prize.
• I met a writer who publishes educational articles.

In indirect questions

• Tell me who prepared the presentation.
• I wonder who will arrive first.

In each case, who performs the action or serves as the subject of the relevant clause.

When to Use Whom

Use whom when referring to the object of a verb or preposition.

As the object of a verb

• Whom did you choose?
• Whom does the company employ?
• Whom have they invited?

After a preposition

• To whom should I send the form?
• With whom did you travel?
• For whom was this book written?

In relative clauses

• The colleague whom I contacted replied.
• The candidate whom the panel selected accepted the offer.

In informal English, many speakers use who in some of these object positions. Nevertheless, whom remains useful when a formal or traditional grammatical style is expected.

When NOT to Use Each One

Avoiding incorrect usage requires understanding the grammatical role of the pronoun.

When Not to Use Who

Do not use who as the object form when traditional formal grammar requires whom.

Incorrect in formal English: To who should I send the letter?

Preferred formal version: To whom should I send the letter?

However, “Who should I send the letter to?” is a natural and widely accepted informal construction.

Also, do not use who merely because the question asks about a person. The fact that a sentence refers to a person does not automatically make who correct.

Incorrect: Whom is waiting outside?

Correct: Who is waiting outside?

When Not to Use Whom

Do not use whom as the subject of a verb.

Incorrect: Whom wrote the report?

Correct: Who wrote the report?

Do not use whom in a clause when it performs the action.

Incorrect: She knows whom will attend the conference.

Correct: She knows who will attend the conference.

Also, avoid using whom unnecessarily in casual conversation if it makes the sentence sound stiff. Choose a natural construction that suits the situation while preserving the correct grammatical meaning.

Which One to Use: Decision Guide

If you are unsure whether to use who or whom, follow this simple decision process.

Step 1: Identify the Action

Find the verb connected to the person you are describing.

Example: Who opened the window?

The person performed the action of opening, so who is correct.

Step 2: Check Whether the Person Performs or Receives the Action

Ask whether the person is doing something or having something done to them.

• Person performing the action: Who called the manager?
• Person receiving the action: Whom did the manager call?

Step 3: Apply the He or Him Test

Replace the pronoun with he or him.

Example: Who is at the door?

Answer: He is at the door.

Because he works, who is correct.

Example: Whom did you invite?

Answer: I invited him.

Because him works, whom is correct in traditional formal grammar.

Step 4: Check for a Preposition

If a preposition appears immediately before the pronoun, whom is normally used in formal English.

Examples:

• To whom does this belong?
• With whom are you speaking?
• By whom was the decision made?

Step 5: Consider Your Audience

In academic papers, formal correspondence, and professional documents, use the traditional distinction carefully. In everyday speech, object who constructions are common and often sound more natural.

Quick Decision Table

If you mean…	Choose	Example
The person doing the action	Who	Who sent the package?
The person receiving the action	Whom	Whom did you call?
The subject of a relative clause	Who	The person who called is here.
The object of a relative clause	Whom	The person whom I called is here.
The object after a preposition in formal writing	Whom	To whom did you write?

Real-World Practical Examples

The following examples show how who and whom work in different situations, including education, daily life, science, business, writing, and technology.

Who Examples

1. Education: Who explained the grammar lesson to the class?
2. Daily life: Who left their umbrella near the entrance?
3. Business: Who approved the new marketing strategy?
4. Science: Who developed the hypothesis being tested?
5. Writing: Who wrote the introduction to this article?
6. Technology: Who created the latest software update?
7. Conversation: Who wants to order lunch?
8. Travel: Who booked the hotel room?
9. Healthcare: Who is responsible for updating the patient’s schedule?
10. Sports: Who scored the winning goal?

In all these examples, who is the subject of the relevant verb or clause.

Whom Examples

1. Education: Whom did the teacher ask to answer the question?
2. Daily life: Whom did you meet at the grocery store?
3. Business: To whom should I forward the contract?
4. Science: Whom did the researchers interview for the study?
5. Writing: Whom did the editor ask to revise the article?
6. Technology: Whom should we contact about the technical problem?
7. Conversation: Whom did you invite to dinner?
8. Travel: With whom will you share the hotel room?
9. Healthcare: Whom did the doctor consult about the case?
10. Sports: Whom did the coach select for the final match?

In these examples, whom functions as an object of a verb or preposition.

Self-Assessment: Fill in the Blanks

Test your understanding of who vs whom by completing the following 20 sentences. Choose the word that best fits the grammatical role of the pronoun.

1. ______ called you after the meeting?
2. ______ did you invite to your birthday party?
3. To ______ should I address this application?
4. The woman ______ teaches mathematics is very helpful.
5. With ______ are you planning to travel?
6. ______ is responsible for this decision?
7. The student ______ the teacher praised received an award.
8. ______ wants to participate in the competition?
9. For ______ did you buy this gift?
10. I wonder ______ prepared the presentation.
11. ______ did the manager select for the position?
12. The author ______ wrote this book is famous.
13. By ______ was the letter delivered?
14. ______ has completed the assignment?
15. The colleague ______ I contacted answered quickly.
16. ______ are you speaking to?
17. The scientist ______ discovered the substance received recognition.
18. From ______ did you receive this information?
19. I know ______ will lead the discussion.
20. ______ did the committee appoint as chairperson?

Answers

Check your responses against the numbered answer key below. Each answer includes a brief explanation to help reinforce the difference between the two pronouns.

1. Who — The person calling performs the action.
2. Whom — The person invited receives the action of inviting.
3. Whom — The pronoun follows the preposition to.
4. Who — The person teaches mathematics, so the pronoun is the subject of teaches.
5. Whom — The pronoun follows the preposition with.
6. Who — The pronoun is the subject of is responsible.
7. Whom — The student receives the action of being praised.
8. Who — The pronoun is the subject of wants.
9. Whom — The pronoun follows the preposition for.
10. Who — The person prepares the presentation, so the pronoun is the subject of prepared.
11. Whom — The person receives the action of being selected.
12. Who — The author performs the action of writing.
13. Whom — The pronoun follows the preposition by.
14. Who — The pronoun is the subject of has completed.
15. Whom — The colleague receives the action of being contacted.
16. Whom — This is the traditional formal object form after to. In everyday English, “Who are you speaking to?” is also common.
17. Who — The scientist performs the action of discovering.
18. Whom — The pronoun follows the preposition from.
19. Who — The pronoun is the subject of will lead.
20. Whom — The person receives the action of being appointed.

Conclusion:

Understanding who vs whom becomes much easier when you focus on the grammatical role of the person in a sentence. Use who when referring to the person performing an action, such as “Who called you?” Use whom when referring to the person receiving an action or following a preposition, as in “Whom did you call?” or “To whom should I send this letter?” The simple he or him test can help you choose the correct word whenever you feel uncertain. If he or she fits, use who. If him or her fits, use whom in traditional formal English.

Although who is common in everyday conversations, whom remains valuable in academic writing, professional emails, and formal communication. By practicing these rules and studying real-life examples, you can improve your grammar, avoid common mistakes, and communicate more confidently. Remember, choosing between who and whom depends on meaning, sentence structure, and context.

FAQs

What is the main difference between who and whom?

The main difference between who and whom is their grammatical function. Who acts as the subject of a verb, identifying the person performing an action. Whom acts as the object of a verb or preposition, identifying the person receiving an action. Understanding this subject-object distinction helps you choose the correct word in questions and statements.

When should I use who instead of whom?

Use who when the person you are referring to performs an action or serves as the subject of a clause. For example, “Who wrote this article?” is correct because the person performs the action of writing. You should also use who in sentences such as “I know who called you,” where it remains the subject of the clause.

When should I use whom instead of who?

Use whom when referring to the object of a verb or preposition, particularly in formal English. For example, “Whom did you invite?” is grammatically correct because the person receives the action of inviting. You can also use whom after prepositions, as in “To whom should I send the document?” This usage is common in formal writing.

Is it grammatically correct to say who did you call?

In everyday English, “Who did you call?” is widely accepted and sounds natural. In traditional formal grammar, “Whom did you call?” is preferred because the person being called is the object of the verb. The choice often depends on the audience and level of formality, although who is common in both speech and informal writing.

What is the easiest way to remember who vs whom?

The easiest method is the he or him test. Replace the word with he or him to identify its grammatical role. If he or she fits, use who. If him or her fits, use whom in traditional formal English. For example, “Who called?” becomes “He called,” while “Whom did you call?” becomes “I called him.”

Should I use who or whom in formal writing?

In formal writing, use who for subjects and whom for objects. For example, “Who organized the conference?” is correct, while “To whom should we address the letter?” follows traditional formal grammar. Choosing the appropriate pronoun improves grammatical accuracy and professionalism. However, always examine the sentence structure rather than assuming that every formal question requires whom.

Is whom becoming less common in modern English?

Yes, whom is less common in everyday conversation than it once was. Many English speakers use who in object questions, such as “Who did you meet?” However, whom remains useful in formal writing and after prepositions placed before the pronoun. Learning both forms helps you understand traditional grammar and communicate appropriately in different situations.

Can I use who after a preposition?

In informal English, who can naturally appear when a preposition comes at the end of a sentence, as in “Who are you talking to?” In traditional formal grammar, whom is preferred when the preposition comes before the pronoun: “To whom are you talking?” Both constructions are understandable, but the second is more formal.

What is the difference between who and whom in a question?

Use who when asking about the person performing an action, as in “Who opened the door?” Use whom when asking about the person receiving an action, as in “Whom did you invite?” The important distinction is not whether the sentence is a question but whether the pronoun functions as the subject or object.

Can who and whom introduce relative clauses?

Yes, both words can introduce relative clauses referring to people. Use who when the person is the subject, as in “The teacher who helped me was kind.” Use whom when the person is the object, as in “The teacher whom I thanked smiled.” In informal English, who often replaces whom in object relative clauses.