Have you ever wondered When to Use Who or Whom in a sentence? You are not alone. Many English learners find these two words confusing because they look similar, sound almost alike, and both refer to people. However, they serve different grammatical purposes. “Who” is generally used as a subject, while “whom” is used as an object.
Understanding this simple difference can improve your grammar, writing accuracy, and confidence in English conversations. Whether you are preparing for an English exam, writing a professional email, or improving your everyday communication, knowing when to use who or whom is a valuable skill. This guide explains the rules with simple examples, practical tips, and common mistakes to avoid.
Why “When to Use Who or Whom” Are Confusing
The words “who” and “whom” are among the most commonly confused pronouns in English. Although their grammatical roles are different, their meanings are closely related.
Several factors make these words difficult for learners.
1. Similar Pronunciation
“Who” and “whom” have similar pronunciations, but they are not pronounced exactly the same.
- Who: /huː/
- Whom: /huːm/
The main difference is the final m sound in “whom.”
Because this difference is small, learners may not always notice it during fast conversations.
For example:
- “Who called you?”
- “Whom did you call?”
Both questions refer to people, but the pronouns have different grammatical functions.
2. Similar Spelling
The words differ by only one letter.
- Who
- Whom
The additional “m” in “whom” changes its grammatical role.
This small spelling difference can make it difficult to remember which form belongs in a particular sentence.
3. Context Confusion
Another reason for confusion is that modern spoken English often uses “who” where traditional grammar would require “whom.”
For example:
“Who did you invite?”
This is completely natural in everyday English.
In more formal grammar, the sentence can be written:
“Whom did you invite?”
Both versions are widely understood, but the second follows the traditional object-pronoun rule.
4. Common Learner Mistakes
English learners often make these mistakes:
- Using “whom” as the subject of a sentence.
- Using “who” as an object in formal writing where “whom” is expected.
- Assuming “whom” is always more correct because it sounds formal.
- Choosing the pronoun based only on its position in a sentence.
- Forgetting to identify the subject and object of the relevant clause.
Understanding basic sentence structure is the easiest way to avoid these errors.
When to Use Who or Whom Explained Simply
The main difference between “who” and “whom” depends on whether the pronoun functions as the subject or object of a verb or preposition.
Simple Explanation
Who is a subject pronoun. It refers to the person performing an action or being described.
Whom is an object pronoun. It refers to the person receiving an action or functioning as the object of a preposition.
One-Line Distinction
Use “who” when the person is the subject, and use “whom” when the person is the object in traditional formal grammar.
Two Example Sentences
Example 1: Using Who
“Who wrote this letter?”
Here, “who” is the subject because it refers to the person who performed the action of writing.
Example 2: Using Whom
“Whom did you invite to the party?”
Here, “whom” is the object because it refers to the person receiving the invitation.
A Quick Comparison
Consider these statements:
- “She called me.”
- “I called her.”
In the first sentence, “she” is the subject. In the second, “her” is the object.
The same distinction helps explain who and whom.
- Who called me? — She called me.
- Whom did I call? — I called her.
This connection makes the grammar rule easier to understand.
Understanding Homophones in English
Learning about similar-sounding words can help English learners improve pronunciation, spelling, and sentence structure.
What Are Homophones?
Homophones are words that have the same pronunciation but different meanings and often different spellings.
For example, “hear” and “here” are homophones.
- Hear: To perceive sound.
- Here: In or at this place.
Consider these sentences:
- “Can you hear the music?”
- “Please come here.”
The words sound the same in most English accents, but their meanings are different.
Other common homophones include:
- Sea and see
- Right and write
- Flour and flower
- One and won
- Their and there
It is important to note that who and whom are not homophones. They sound similar, but “whom” contains an additional final consonant sound.
Their confusion comes mainly from grammar and modern usage rather than identical pronunciation.
Why Homophones Cause Confusion
Homophones can be difficult because listeners cannot always identify the correct spelling from sound alone.
For example:
“I can see the sea.”
Both words sound alike, but their meanings depend on context.
With “who” and “whom,” the challenge is different. Learners must understand the grammatical relationship between the pronoun and the other words in the sentence.
For example:
- “Who helped you?”
- “Whom did you help?”
The first asks about the person performing the action. The second asks about the person receiving it.
Therefore, recognizing subjects and objects is more useful than relying on pronunciation.
What Does “Who” Mean?
Definition and Core Meaning
“Who” is a pronoun used to ask about or identify a person, especially when that person is the subject of a clause.
It can function as an interrogative pronoun in questions or a relative pronoun that introduces additional information about a person.
For example:
“Who is standing outside?”
Here, “who” asks about the person standing outside.
Another example is:
“The woman who teaches English is very friendly.”
In this sentence, “who” introduces a relative clause describing the woman.
Origin and Historical Use
The word “who” comes from Old English hwā, an interrogative pronoun used to ask about people.
Early English had a more complex grammatical case system, with different forms of pronouns depending on their function.
As English developed, many grammatical endings disappeared, but the distinction between “who” and “whom” survived.
Today, “who” remains extremely common in both spoken and written English.
Modern Usage and Synonyms
In modern English, “who” is used in several important ways.
- Asking questions: “Who is your teacher?”
- Identifying people: “Who lives in that house?”
- Introducing relative clauses: “The student who won the prize is my friend.”
- Asking about responsibility: “Who made this decision?”
- Describing someone: “She is the person who helped me.”
Possible alternatives depend on the sentence.
For example, “which person” can sometimes replace “who” in a question:
“Which person called you?”
However, “who” is generally more natural when asking about someone’s identity.
Example Sentences
- “Who is coming to dinner tonight?”
- “Who opened the window?”
- “The boy who won the competition is my neighbour.”
- “Who wants to join the English class?”
- “She knows the person who designed this building.”
- “Who will lead the meeting tomorrow?”
In each example, “who” functions as the subject of its own clause.
What Does “Whom” Mean?
Definition and Core Meaning
“Whom” is the object form of “who.” It refers to a person who receives an action or follows a preposition.
For example:
“Whom did you meet yesterday?”
The person being asked about is the object of the verb “meet.”
Another example is:
“To whom should I send this email?”
Here, “whom” is the object of the preposition “to.”
In everyday conversation, many speakers would instead say:
“Who should I send this email to?”
Both sentences are understandable and natural in their respective styles.
Origin and Historical Context
The word “whom” developed from Old English hwām, a form used for certain grammatical cases.
Historically, English used different pronoun forms to show whether a person was performing an action or receiving it.
Although English grammar became simpler over time, “whom” remained part of the language.
Today, it is most common in formal writing, official communication, traditional grammar exercises, and expressions involving prepositions.
Modern Usage and Synonyms
In contemporary English, “whom” is less common in casual speech than “who.”
However, it remains useful in formal contexts.
Common situations include:
- Formal questions: “Whom should we contact?”
- After prepositions: “To whom does this belong?”
- Relative clauses: “The candidate whom we interviewed was qualified.”
- Professional communication: “With whom should I discuss this matter?”
- Formal announcements: “The person to whom the award was presented thanked the committee.”
In many everyday sentences, “who” can replace “whom,” particularly when the preposition appears at the end.
For example:
Formal: “With whom are you travelling?”
Conversational: “Who are you travelling with?”
Both are acceptable in modern English, although they differ in formality.
Example Sentences
- “Whom did you invite to the celebration?”
- “To whom should I address the letter?”
- “The teacher whom we met yesterday was very helpful.”
- “With whom did you discuss the project?”
- “Whom should I ask for assistance?”
- “The manager to whom I reported was supportive.”
In these examples, “whom” functions as an object rather than a subject.
When to Use Who or Whom: Key Differences at a Glance
The following comparison table summarizes the most important differences.
| Word | Part of Speech | Meaning | Example Context |
|---|---|---|---|
| Who | Subject pronoun | Identifies the person performing an action or serving as a subject | “Who called you?” |
| Whom | Object pronoun | Identifies the person receiving an action | “Whom did you call?” |
| Who | Relative pronoun | Introduces a clause in which the person is the subject | “The woman who helped me is kind.” |
| Whom | Relative pronoun | Introduces a clause in which the person is the object | “The woman whom I helped was grateful.” |
| Whom | Object of a preposition | Refers to a person following a preposition | “To whom should I speak?” |
The Most Important Grammar Rule
The traditional rule is:
- Who = Subject
- Whom = Object
However, modern English often uses “who” for objects, especially in conversation.
For example:
“Who did you meet?”
This is normal everyday English.
“Whom did you meet?”
This is more formal and follows the traditional case distinction.
How to Remember the Difference Between When to Use Who or Whom
There are several simple memory tricks that can help you choose the correct pronoun.
1. The He/Him Trick
One of the easiest ways to remember the difference is to replace the unknown person with “he” or “him.”
Use:
- Who if “he” or “she” fits.
- Whom if “him” or “her” fits.
For example:
“___ called you?”
Answer: “He called me.”
Because “he” fits, the correct pronoun is “who.”
Now consider:
“___ did you call?”
Answer: “I called him.”
Because “him” fits, the traditional correct pronoun is “whom.”
2. Remember the Letter M
Both whom and him end with the letter “m.”
This creates an easy memory connection:
Whom → Him
If the answer would naturally use “him,” “her,” or “them,” the question traditionally requires “whom.”
For example:
“Whom did she invite?”
“She invited him.”
3. Identify the Subject and Object
Another useful technique is to find the action in the sentence.
Ask yourself:
- Who is performing the action?
- Who is receiving the action?
For example:
“The teacher praised the student.”
The teacher performs the action, while the student receives it.
Therefore:
- “Who praised the student?”
- “Whom did the teacher praise?”
4. Use One Memorable Example
Imagine that your friend receives a mysterious phone call.
You ask:
“Who called you?”
Your friend replies:
“He called me.”
Then you ask:
“Whom did you call back?”
Your friend replies:
“I called him back.”
The first question asks about the person performing the action. The second asks about the person receiving it.
This example helps connect “who” with “he” and “whom” with “him.”
5. Check the Pronoun’s Own Clause
In longer sentences, identify the grammatical role inside the clause containing the pronoun.
For example:
“Whom do you think she invited?”
The relevant clause is “she invited ___.”
Because the missing person is the object of “invited,” “whom” is traditionally correct.
Now compare:
“Who do you think invited her?”
The relevant clause is “___ invited her.”
The missing person performs the action, so “who” is correct.
This method is especially helpful for advanced grammar questions.
Common Mistakes and Confusions
Understanding common errors can help you use these pronouns more accurately.
Mistake 1: Using Whom as a Subject
✘ Incorrect: “Whom is coming to the party?”
✔ Correct: “Who is coming to the party?”
Explanation: The person is performing the action of coming, so the subject pronoun “who” is required.
Mistake 2: Using Who After a Fronted Preposition
✘ Incorrect in standard formal grammar: “To who should I send the documents?”
✔ Correct: “To whom should I send the documents?”
Explanation: When a preposition comes directly before the pronoun in this construction, “whom” is the standard choice.
Mistake 3: Assuming Whom Is Always More Formal and Therefore Better
✘ Incorrect: “Whom wrote this report?”
✔ Correct: “Who wrote this report?”
Explanation: “Whom” cannot replace “who” simply to make a sentence sound formal. The grammatical role determines the correct form.
Mistake 4: Choosing Based Only on Word Position
✘ Incorrect: “Whom do you think will win?”
✔ Correct: “Who do you think will win?”
Explanation: Although the pronoun appears before “do you think,” it is the subject of “will win.” Therefore, “who” is correct.
Mistake 5: Believing Whom Is Required in Every Object Question
Traditional formal: “Whom did you see?”
Natural conversational English: “Who did you see?”
Explanation: Both are acceptable in modern English. “Whom” follows the traditional object rule, while “who” is widely accepted in everyday speech and informal writing.
Examples Section: Correct and Incorrect Usage
The following examples show how to use “who” and “whom” in different situations.
Example 1: Asking About the Subject
✔ Correct: “Who broke the glass?”
✘ Incorrect: “Whom broke the glass?”
Why? The pronoun refers to the person performing the action.
Example 2: Asking About an Object
✔ Correct: “Whom did the teacher praise?”
✘ Incorrect in traditional formal grammar: “Who did the teacher praise?”
Why? The person receiving the praise is the object. However, the second version is normal in everyday English.
Example 3: Using a Preposition
✔ Correct: “With whom are you working?”
✘ Incorrect in standard formal grammar: “With who are you working?”
Why? “Whom” is the object of the preposition “with.”
Example 4: Introducing a Relative Clause
✔ Correct: “The student who answered the question received a prize.”
✘ Incorrect: “The student whom answered the question received a prize.”
Why? The pronoun is the subject of “answered.”
Example 5: Identifying an Object in a Relative Clause
✔ Correct: “The man whom we interviewed was experienced.”
✘ Incorrect in traditional formal grammar: “The man who we interviewed was experienced.”
Why? The pronoun is the object of “interviewed.” However, the second version is common and acceptable in modern informal English.
Example 6: Using a Longer Question
✔ Correct: “Who do you believe is responsible?”
✘ Incorrect: “Whom do you believe is responsible?”
Why? The pronoun is the subject of “is responsible,” even though another clause appears between the pronoun and the verb.
Self-Assessment: Test Your Knowledge
Choose the correct pronoun to complete each sentence according to traditional formal grammar.
Question 1: ___ is responsible for organizing the meeting?
a) Who
b) Whom
Question 2: To ___ should I address this letter?
a) Who
b) Whom
Question 3: The woman ___ helped us was very friendly.
a) Who
b) Whom
Question 4: ___ did you invite to the wedding?
a) Who
b) Whom
Self-Assessment Answers
Answer 1: a) Who
“Who is responsible for organizing the meeting?”
The pronoun functions as the subject of the sentence.
Answer 2: b) Whom
“To whom should I address this letter?”
The pronoun is the object of the preposition “to.”
Answer 3: a) Who
“The woman who helped us was very friendly.”
The pronoun is the subject of the relative clause.
Answer 4: b) Whom
“Whom did you invite to the wedding?”
The pronoun functions as the object of the verb “invite.” In everyday conversation, “Who did you invite?” is also acceptable.
Check Your Score
- 4 correct: Excellent! You understand the main grammar rules.
- 3 correct: Very good. Review the question you missed.
- 1–2 correct: Keep practising the he/him memory trick.
- 0 correct: Start by reviewing the difference between subjects and objects.
FAQs About Who and Whom
1. What Is the Main Difference Between Who and Whom?
“Who” is traditionally used as a subject, while “whom” is used as an object. For example, “Who called you?” asks about the subject, while “Whom did you call?” asks about the object.
2. When Should I Use Who Instead of Whom?
Use “who” when the pronoun is the subject of its clause. For example, “Who is speaking?” and “The person who helped me was kind.”
3. When Should I Use Whom in a Sentence?
Use “whom” when the pronoun is an object, particularly in formal writing. For example, “Whom did you contact?” or “To whom should I speak?”
4. Is It Correct to Say “Who Did You Talk To” or “Whom Did You Talk To”?
Both are acceptable in modern English. “Who did you talk to?” is natural in everyday conversation. “Whom did you talk to?” follows the traditional object-pronoun rule and sounds more formal.
5. Is Whom Still Used in Modern English?
Yes. “Whom” remains common in formal writing, professional communication, and expressions such as “to whom it may concern.” However, it is less common in casual speech.
6. What Is the Easiest Trick to Remember Who vs Whom?
Use the he/him test. If “he” or “she” fits, choose “who.” If “him” or “her” fits, choose “whom” in traditional grammar.
7. Is “To Whom It May Concern” Grammatically Correct?
Yes. “To whom it may concern” is a traditional formal greeting used when the recipient’s name is unknown. “Whom” is correct because it is the object of the preposition “to.”
Final Conclusion: Using Who and Whom Correctly
Understanding when to use “who” or “whom” is an important step toward improving your English grammar and writing confidence. Although these pronouns look and sound similar, they have different grammatical functions. “Who” is traditionally used as a subject, while “whom” is used as an object of a verb or preposition. Remembering this basic distinction can help you construct clearer questions, write accurate relative clauses, and avoid common grammar mistakes.
One of the easiest ways to choose between them is the he/him trick. If the sentence can be answered using “he” or “she,” choose “who.” If “him,” “her,” or “them” fits, “whom” is traditionally appropriate. For example, “Who called you?” matches “He called me,” while “Whom did you call?” matches “I called him.” This simple method works in many everyday situations.
It is also important to recognize how English is actually spoken today. In casual conversations, “who” frequently replaces “whom,” even when the pronoun functions as an object. However, “whom” remains useful in formal writing, professional communication, and certain established expressions.
As you continue learning English, practise identifying subjects and objects in sentences rather than memorizing rules without context. Read examples, create your own questions, and pay attention to how these pronouns appear in books, conversations, and emails. With regular practice, choosing between “who” and “whom” will become easier, helping you communicate naturally, accurately, and confidently.
David Parker is a language researcher and content writer at WordClarity.com, specializing in English word meanings, comparisons, spelling differences, and usage guides. He creates easy-to-understand content that helps readers improve clarity and confidence in everyday English. His work focuses on making language learning simple, accurate, and practical.