Who and whom are two English pronouns that often confuse learners because they refer to people but serve different grammatical purposes. While many people use who in everyday conversation, whom is still important in formal writing and certain sentence structures. Understanding the difference will help you write and speak more accurately and confidently.
Comparison Overview
Both who vs whom are pronouns used to refer to people, especially when asking questions or introducing relative clauses. The key difference is their grammatical role in a sentence.
| Feature | Who | Whom |
| Part of Speech | Pronoun | Pronoun |
| Function | Subject | Object |
| Refers To | A person performing an action | A person receiving an action |
| Common in Speech | Very common | Less common |
| Common in Formal Writing | Yes | Yes, especially formal English |
| Example | Who called you? | Whom did you call? |
Definition of Who
Who is a subject pronoun used to refer to the person acting. It works like he, she or they.
Key Purpose
- Identifies the subject of a sentence.
- Used in questions and relative clauses.
- Refers only to people.
Examples
- Who is at the door?
- The teacher who explained the lesson was helpful.
- Who wants ice cream?
Definition of Whom
Whom is an object pronoun used for the person receiving an action. It works like him, her or them.
Key Purpose
- Identifies the object of a verb or preposition.
- Mostly used in formal English.
- Refers only to people.
Examples
- Whom did you invite?
- To whom should I send the email?
- The person whom I met was friendly.
Main Differences Between Who and Whom
| Feature | Who | Whom |
| Grammar Role | Subject | Object |
| Replaces | He, She, They | Him, Her, Them |
| Performs Action | Yes | No |
| Receives Action | No | Yes |
| Common Usage | Formal and informal | Mostly formal |
| Example | Who wrote this book? | Whom did you meet? |
Key Difference
Use who when the person is doing the action.
Use whom when the person is receiving the action.
Who vs Whom: Side-by-Side Comparison
| Situation | Correct Word | Example |
| Asking about the subject | Who | Who called? |
| Asking about the object | Whom | Whom did you call? |
| After a preposition | Whom | With whom are you traveling? |
| Informal conversation | Who | Who are you talking to? |
| Formal writing | Whom | To whom it may concern |
Why People Confuse Who and Whom
Many native speakers rarely use whom in casual conversation. As a result, learners often hear only who, even where whom is technically correct. Modern English has become less strict in spoken language, but formal writing still follows the traditional grammar rules.
Grammar Guide
Both who and whom are interrogative pronouns and relative pronouns.
- Who functions as a subject pronoun.
- Whom functions as an object pronoun.
How each term is used in sentences
Using Who
Pattern:
Who + verb…?
Examples:
- Who arrived first?
- Who baked the cake?
- Who teaches English?
Using Whom
Pattern:
Whom + auxiliary verb + subject + main verb…?
Examples:
- Whom did you invite?
- Whom should I ask?
- Whom are they interviewing?
After prepositions:
- With whom
- For whom
- To whom
- About whom
Examples:
- With whom did you travel?
- To whom was the letter addressed?
Common mistakes learners make
Mistake 1
❌ Whom is coming today?
✅ Who is coming today?
Mistake 2
❌ Who did you invite?
(Formally incorrect)
✅ Whom did you invite?
Mistake 3
❌ Who should I send this to?
(Formal)
✅ To whom should I send this?
Mistake 4
Using whom everywhere to sound formal.
Correct grammar is more important than sounding formal.
Simple rules to remember
Rule 1:
Replace the word with he/she.
If it works, use who.
Example:
Who called?
He called.
Correct.
Rule 2:
Replace the word with him/her.
If it works, use whom.
Example:
Whom did you invite?
I invited him.
Correct.
Rule 3:
After a preposition, use whom in formal English.
Example:
To whom
With whom
For whom
Quick tips for writing and speaking
- Use who when the person acts.
- Use whom when the person receives the action.
- Formal letters often use whom.
- Everyday speech usually favors who.
- When unsure in conversation, who is generally accepted.
When to Use Each One
Use Who when:
- Asking who acted.
- Referring to the subject.
- Writing naturally.
- Speaking casually.
- Introducing relative clauses.
Examples:
- Who won?
- Who knows the answer?
- The student who helped me graduated.
Use Whom when:
- Referring to the object.
- After a preposition.
- Writing academic papers.
- Writing business letters.
- Using formal grammar.
Examples:
- Whom did you choose?
- For whom is this gift?
- To whom should I complain?
When NOT to Use Each One
Don’t use Who
- After formal prepositions when an object is required.
- When replacing him/her/them.
Incorrect:
- To who should I speak?
Correct:
- To whom should I speak?
Don’t use whom
- As the subject of a sentence.
- Before verbs when it acts.
Incorrect:
- Whom wants pizza?
Correct:
- Who wants pizza?
Which One to Use (Decision Guide)
Ask yourself these questions:
- Is the person doing the action?
- Yes → Who
- Is the person receiving the action?
- Yes → Whom
- Can you replace it with he/she?
- Yes → Who
- Can you replace it with him/her?
- Yes → Whom
- Is it after a preposition in formal writing?
- Yes → Whom
Real-World Practical Examples
Who Examples
- Who solved the math problem first?
- Who left the lights on?
- Who developed this software?
- Who manages the marketing team?
- Who discovered the new planet?
Whom Examples
- Whom did the teacher praise?
- Whom should I contact for support?
- To whom does this office belong?
- The scientist whom we interviewed won an award.
- With whom are you attending the conference?
Self-Assessment (Fill in the Blanks)
- I will use ______ when referring to the person acting. The correct word is ______ because it is the subject.
- I will use ______ when referring to the person receiving an action. The correct word is ______ because it is the object.
- ______ is knocking at the door? The correct word is ______ because the person acts.
- ______ did you invite to dinner? The correct word is ______ because the person receives the action.
- To ______ should I address this letter? The correct word is ______ because it follows a preposition.
- ______ won the competition? The correct word is ______ because it is the subject.
- The student ______ answered first received a prize. The correct word is ______ because it is the subject.
- The employee ______ I hired starts Monday. The correct word is ______ because it is the object.
- With ______ are you traveling? The correct word is ______ because it follows a preposition.
- ______ called this morning? The correct word is ______ because it acts.
- ______ are they interviewing today? The correct word is ______ because it is the object.
- ______ wrote this article? The correct word is ______ because it is the subject.
- The author ______ we met signed our books. The correct word is ______ because it is the object.
- ______ wants another cup of coffee? The correct word is ______ because it is the subject.
- For ______ was the award created? The correct word is ______ because it follows a preposition.
- ______ discovered the error? The correct word is ______ because it acts.
- The manager ______ everyone respects retired. The correct word is ______ because it is the object.
- ______ is responsible for this project? The correct word is ______ because it is the subject.
- About ______ were they talking? The correct word is ______ because it follows a preposition.
- ______ completed the assignment first? The correct word is ______ because it is the subject.
Answers
- Who, Who
- Whom, Whom
- Who, Who
- Whom, Whom
- Whom, Whom
- Who, Who
- Who, Who
- Whom, Whom
- Whom, Whom
- Who, Who
- Whom, Whom
- Who, Who
- Whom, Whom
- Who, Who
- Whom, Whom
- Who, Who
- Whom, Whom
- Who, Who
- Whom, Whom
- Who, Who
Final Verdict
Choosing between who and whom becomes much easier once you understand their grammatical roles. Use who when referring to the subject of a sentence—the person acting. Use whom when referring to the object—the person receiving the action, especially in formal writing or after prepositions. A simple memory trick is to replace the word with he/she (use who) or him/her (use whom). While everyday conversation often favors who, knowing when whom is grammatically correct will improve your writing, help you communicate more professionally, and give you greater confidence in both academic and formal English.
Conclusion About Who vs Whom
Understanding Who vs Whom doesn’t have to be difficult once you know the basic grammar behind each word. The easiest way to remember the difference is that who is used for the person acting, while whom is used for the person receiving the action. Although whom appears less often in everyday conversation, it remains important in formal writing, academic work and professional communication.
By practicing with real-life examples and applying the simple he/she versus him/her replacement test, you can quickly decide which word fits your sentence. Whether you’re writing an email, preparing an assignment or improving your English skills, mastering who and whom will make your writing clearer and more grammatically accurate. With regular practice, choosing the correct pronoun becomes second nature, helping you communicate with confidence in both casual and formal situations.
FAQs
Who is used as a subject or an object?
Who is used as the subject of a sentence. It refers to the person performing the action, similar to he, she or they. If the person is doing something, who is usually the correct choice. It commonly appears in questions and relative clauses in both spoken and written English.
Whom is used as a subject or an object?
Whom is used as the object of a verb or preposition. It refers to the person receiving the action, much like him, her or them. Although it is less common in casual speech, it is still widely accepted and preferred in formal writing and professional communication.
Is it acceptable to use who instead of whom in everyday conversation?
Yes. In everyday English, many native speakers use who instead of whom, even in situations where whom is traditionally correct. While this is generally accepted in casual conversation, using whom in formal writing or official documents demonstrates stronger grammatical accuracy.
How can I quickly decide whether to use who or whom?
A simple trick is to replace the word with he or him. If he fits naturally, use who. If him sounds correct, use whom. This easy substitution method works in most sentences and helps eliminate confusion without needing to analyze complex grammar rules.
Is whom still used in modern English?
Yes. Although whom is less common in everyday speech, it is still used in formal writing, legal documents, academic papers, business correspondence and certain fixed expressions. Knowing when to use whom helps make your writing sound polished and grammatically correct.
Why do so many people confuse who and whom?
People often confuse these words because modern spoken English frequently replaces whom with who. Since both words refer to people, learners may not realize they serve different grammatical functions. Understanding the difference between subjects and objects makes choosing the correct word much easier.
Can whom be used after a preposition?
Yes. In formal English, whom should be used after prepositions such as to, with, for, about, and by. Examples include “To whom should I write?” and “With whom are you traveling?” This is one of the clearest situations where whom is grammatically correct.
Which is more common in everyday English, who or whom?
Who is far more common than whom in everyday conversation. Most informal conversations, social media posts, and casual writing naturally favor who. However, understanding whom is still valuable for reading, writing and speaking in formal or professional settings.
Can who and whom both be used in relative clauses?
Yes. Who is used when the relative pronoun acts as the subject, while whom is used when it functions as the object. For example, “The student who won the award” uses who, whereas “The student whom I met” correctly uses whom.
What is the biggest rule to remember for who vs whom?
The most important rule is simple: use who for the person doing the action and whom for the person receiving the action. If you remember the he/she versus him/her test, you’ll be able to choose the correct word confidently in most writing and speaking situations.
