How to Use Who and Whom Correctly: Rules and Simple Tricks

To get these right, you first need to look at the job the word is doing in the sentence. In Standard American English, these two words are pronouns that represent people, but they play very different roles. One acts as the boss of the action, while the other is simply along for the ride. Using the wrong one can change the structure of your sentence or make your writing feel a bit off to a careful reader.

The fundamental difference comes down to whether the word is a subject pronoun or an object pronoun. A subject pronoun is the person performing the action, while an object pronoun is the person receiving the action or following a preposition.

• Who is a subject pronoun. It works just like the words I, he, she, we, and they. If the person is doing something, like running or speaking, you use who.
• Whom is an object pronoun. It works like me, him, her, us, and them. Use it when the person is being affected by an action or is the object of a preposition like to, with, or for.

In everyday conversation, the strict rules for whom have started to fade. Many people use who in almost every situation because it feels more natural and less stuffy. However, in academic papers, professional reports, and formal letters, using whom correctly is still a mark of polished writing. It bridges the gap between modern habits and traditional clarity.

If you are still feeling a little shaky about which one to pick, do not worry. You do not need to be a grammar expert to get it right every time. There is a simple, foolproof trick that uses other pronouns to help you decide the winner without any stress.

The Difference of Who and Whom: The He/Him Trick

If you are stuck trying to figure out the difference of who and whom, there is a simple shortcut that works almost every time. Instead of overthinking the grammar rules, you can use a he/him substitution to find the right answer. This test helps you see whether the person you are talking about is the one doing the action or the one receiving it.

The trick relies on matching the pronoun to its related subject or object form. Since 'who' is a subject pronoun and 'whom' is an object pronoun, they correspond directly to 'he' and 'him.' If you can replace the word with 'he' or 'she,' you should use 'who.' If 'him' or 'her' fits better, then 'whom' is your best choice.

To help you remember this connection, look at the last letter of the words. It serves as a perfect mnemonic for your writing.

Both 'him' and 'whom' end with the letter 'm', making it easy to remember that they belong together in a sentence.

When to Use Who or Whom

You should use 'who' when the person is the subject of the sentence, meaning they are the one performing the action. For instance, in the sentence 'Who ate the cookies?', you can test it by asking if 'he' or 'him' ate them. Since 'he ate them' sounds right, 'who' is the correct choice.

On the flip side, 'whom' is the recipient of an action or the object of a preposition. If you are writing a formal letter and say, 'To whom should I send this?', the test still applies. You would send it to 'him,' not to 'he,' so the 'm' at the end of 'him' tells you to use 'whom.'

When to Use Whom or Who

Questions can sometimes feel more confusing, but the substitution test holds steady if you look at the potential answer. If you ask, 'Whom did you call?', the answer would be 'I called him.' Because 'him' is the answer, 'whom' is the grammatically correct pronoun for the question.

In casual conversation, many people choose to use 'who' even when 'whom' is technically required. While 'with who' is common in spoken English, 'with whom' remains the standard for academic and professional writing. Choosing the right one depends on whether you want to sound strictly formal or more relaxed and approachable.

Understanding Prepositions and the Whom Rule

Many people assume that because whom often follows words like with, to, or for, it must be a preposition itself. This is a common point of confusion. In reality, neither who nor whom can be classified as a preposition. They are pronouns that take on different roles depending on where they sit in a sentence.

The reason they are so closely linked to prepositions is that whom frequently serves as the object of the preposition. This refers to the noun or pronoun that follows a preposition to complete a phrase. While using who in these situations has become common in casual conversation, formal writing still demands the object form.

Is Who a Preposition Word?

To clear up any doubt: no, who is not a preposition. It is a subject pronoun, putting it in the same category as words like he, she, and they. Its job is to represent the person performing the action in a sentence. Because it is a subject pronoun, is who a preposition is a question with a firm negative answer.

When you are writing, remember that who should never be the object of the preposition in a formal context. For example, in the phrase to who, the pronoun is incorrectly acting as an object. In strict grammar, that role is reserved for whom. While is who a preposition might be a common search query, the word is strictly a subject-based pronoun.

Is Who a Prepositional Phrase?

A prepositional phrase is a group of words that begins with a preposition and ends with an object. While who can be part of a larger sentence structure, it is not a prepositional phrase on its own. A true prepositional phrase requires a preposition at the start, such as with, by, or from, followed by an object.

Because whom is an object pronoun, it is the natural fit for these phrases. Using with whom is the formal standard because whom correctly functions as the object. Even though people often use with who in casual speech, it is technically incorrect because who cannot function as an object. The table below shows how these phrases change between informal and formal styles.

Scroll sideways to see the full table →

Understanding this distinction is the first step toward polished writing. Once you recognize that whom is the required form following a preposition, you can handle even the most formal correspondence with ease. This leads naturally into one of the most famous formal phrases in the English language: the traditional salutation To Whom It May Concern.

How Do You Spell to Whom and Other Formal Phrases

In professional settings, the way you handle specific phrases can signal your attention to detail. When the stakes are high, such as in a formal business letter or a legal document, knowing how do you spell whom correctly is just the beginning. Precision in these greetings often sets the tone for the entire interaction.

A common point of confusion for many writers is how do you spell to whom in the context of a formal salutation. The phrase To Whom It May Concern is a classic example of high-stakes grammar. Every word in this greeting should be capitalized, and it must be followed by a colon rather than a comma to maintain proper formal standards.

While this specific greeting is often viewed as old fashioned or impersonal, it still has a place in modern professional life. It is particularly appropriate for letters of recommendation, formal complaints, or letters of interest where a specific contact person is not yet known. However, using it in a standard cover letter might suggest a lack of research, as hiring managers often prefer more personalized alternatives like a specific job title or department name.

To ensure your formal correspondence looks professional and follows established standards, use this checklist for formatting your greetings.

1. Capitalize every word in the phrase To Whom It May Concern.
2. Use a colon after the greeting to signal a formal introduction.
3. Verify the spelling of whom to ensure you have not accidentally used who.
4. Save this specific salutation for documents like recommendation letters where the recipient is truly unknown.
5. Research a specific name or job title first to avoid appearing lazy to your reader.

Using these formal phrases correctly bridges the gap between traditional grammar and modern business expectations. While casual speech is becoming more relaxed, professional writing still demands this level of care. Understanding these nuances prepares you for the next step, which is exploring how these rigid rules are shifting in our daily, informal conversations.

How Do You Use Who and Whom Correctly in Modern English

Language is a living thing, and the way we speak often moves faster than the rules in a grammar book. While the technical distinction between subject and object pronouns remains clear on paper, the practical application of how do you use who and whom correctly depends largely on your surroundings. In many circles, the strict adherence to these rules has shifted, creating a gap between formal expectations and everyday reality.

In casual speech, using whom can sometimes feel overly stiff or even awkward. Most people naturally lean toward who in their daily conversations, even when the pronoun serves as the object of a verb or preposition. While saying with who is technically incorrect by traditional standards, it has become a common staple of informal communication. This evolution shows that while rules provide a foundation, clarity and comfort often take the lead when we are just chatting with friends.

Formal Writing and Academic Contexts

Even though casual speech is flexible, formal environments still demand precision. In academic papers, professional legal documents, and high level business correspondence, using whom correctly as a relative pronoun is essential for maintaining an authoritative tone. These contexts rely on traditional grammar to ensure clarity and professionalism. For instance, while you might ask who are you going with? at lunch, a formal invitation would always specify to whom the RSVP should be sent.

The role of whom as a relative pronoun is also evolving. It is used to connect a relative clause to a main clause, helping to provide extra detail about a person being affected by an action. Because academic writing serves as a permanent record, sticking to the prescriptive rules helps prevent the appearance of laziness or a lack of attention to detail.

To find confidence in any setting, you can always fall back on the substitution trick. If you can replace the word with him, then whom is your best choice. If he fits better, stick with who. By using this simple guide, you can bridge the gap between strict grammar and modern reality, ensuring you sound natural in a coffee shop and professional in the boardroom.