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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
with whom
Grammar usage guide and real-world examplesUSAGE SUMMARY
"with whom" is correct and usable in written English.
You can use it to introduce a clause that defines the person or people being referred to, as in: She was the only person, with whom I could share my secrets.
✓ Grammatically correct
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
With whom?
News & Media
In consultation with whom?
News & Media
And with whom?
News & Media
But with whom?
News & Media
Or with whom.
News & Media
Friends with whom she talks?
News & Media
What mattered was with whom.
News & Media
With whom are they fighting?
News & Media
Now who's messing with whom?
News & Media
Mainly, who's talking with whom?
News & Media
With whom is she arguing?
News & Media
Expert writing Tips
Best practice
Use "with whom" in formal writing and when constructing questions where the person is the object of the preposition.
Common error
Avoid using "with who" in formal writing. While increasingly common in informal speech, it is still considered grammatically incorrect in formal contexts. Always use "with whom" when a preposition precedes the pronoun.
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "with whom" functions as a prepositional phrase, typically introducing a relative clause or forming part of an interrogative sentence. It identifies the person that is the object of the preposition 'with'. Ludwig provides numerous examples illustrating this function.
Frequent in
News & Media
60%
Science
20%
Wiki
10%
Less common in
Formal & Business
5%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "with whom" is a grammatically correct and commonly used phrase, primarily functioning as a prepositional phrase to introduce relative clauses or interrogative sentences. As confirmed by Ludwig, it specifies the person involved in an action or relationship and is particularly suited to formal and scientific contexts. While the alternative "with who" exists, "with whom" remains the preferred choice for maintaining grammatical correctness in formal writing. Its prevalence in sources like The New York Times and academic journals underscores its suitability for professional communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
with which person
Replaces the pronoun "whom" with the noun "person", emphasizing the individual nature of the interaction, while being slightly less formal.
with who
Uses the less formal pronoun "who" instead of "whom", acceptable in casual speech but often discouraged in formal writing.
to whom
Indicates the recipient of something, focusing on directionality rather than accompaniment, thus slightly altering the context.
alongside whom
Emphasizes the idea of being together or side-by-side with someone, adding a sense of partnership or collaboration.
in company with whom
Highlights the social aspect of being with someone, emphasizing companionship and shared experience.
together with whom
Stresses the collective nature of an activity or situation, indicating joint participation or presence.
in whose company
Highlights the social dynamics of being with someone, emphasizing companionship and shared experience.
among whom
Focuses on being part of a larger group of people, suggesting inclusion and shared characteristics.
with whomever
Indicates that the choice of person is unrestricted, suggesting flexibility and lack of preference.
in collaboration with whom
Highlights a working partnership; focuses on teamwork.
FAQs
How to use "with whom" in a sentence?
"With whom" is used to introduce a clause where you're asking about or specifying the person someone is interacting with. For example, "With whom did you speak?" or "She is the person "with whom I work"".
Is "with who" grammatically correct instead of "with whom"?
While "with who" is often heard in casual conversation, it's generally considered grammatically incorrect in formal writing and speech. "With whom" is the correct form when the pronoun is the object of the preposition "with".
What's the difference between "with whom" and "who"?
"Who" is a subjective pronoun (used as the subject of a verb), whereas "with whom" is an objective pronoun (used as the object of a preposition or verb). Therefore, you'd use "with whom" when "with" is part of the phrase.
When should I use "with whom" instead of other prepositions?
Use "with whom" specifically when you want to indicate association, accompaniment, or interaction with a person and the preposition "with" accurately reflects that relationship. For example, "With whom did you travel?" indicates companionship, while other prepositions might imply different relationships.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested