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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
who
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "who" is correct and usable in written English.
It can be used as a relative pronoun to introduce a clause that provides more information about a person or people. Example: "She is the author who wrote the bestselling novel."
✓ Grammatically correct
News & Media
Alternative expressions(20)
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
Who are you?
News & Media
Who is that?
News & Media
As an environmentalist, and someone who believes that everyone in this world has a right to a healthy and nutritious diet of their choosing, I could not have chosen a more counter-productive path.
News & Media
But who?
News & Media
Who is he?
News & Media
Well, who knows?
News & Media
Who can blame him?
News & Media
Who wouldn't?
News & Media
Unlike the most reliable form of protection, a condom, it is the woman, not the man, who makes the ultimate choice about whether to use the gel.
News & Media
Who can say?
News & Media
Sadly, it is typical of the smears coming from those who would rather not debate policy and substance".
News & Media
Expert writing Tips
Best practice
When using "who" as a relative pronoun, ensure the clause it introduces is essential to the meaning of the sentence. If the clause is non-essential, use commas to set it off.
Common error
Avoid using "who" when "whom" is grammatically correct. Use "whom" when it is the object of a verb or preposition. For example, use "To whom did you give the book?" instead of "To who did you give the book?"
Source & Trust
94%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
Who primarily functions as an interrogative pronoun to ask questions about persons or as a relative pronoun to introduce clauses providing more information about people. As Ludwig AI explains, it correctly introduces questions or identifies individuals within a sentence.
Frequent in
News & Media
100%
Less common in
Science
0%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the pronoun "who" is commonly used in the English language as confirmed by Ludwig AI. It serves as an interrogative pronoun, primarily used to ask questions about persons, and as a relative pronoun, used to introduce clauses that provide additional information about people. As evidenced by the examples gathered from diverse sources, the register of "who" is generally neutral, applicable to both formal and informal communication. As shown by Ludwig, most of the examples are from news and media sources.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
the person that
Highlights the role or characteristic of the individual.
the people that
Refers to a group of people with a shared characteristic or role.
which person
Focuses on identifying a specific individual from a group.
the one that
Refers to a single person among others, emphasizing their unique role.
what individual
Emphasizes the specific identity of a person.
which individuals
Focuses on identifying multiple specific individuals from a group.
which of the people
Directs attention to a selection from a larger group.
whom
More formal alternative, typically used as the object of a verb or preposition.
what person or persons
Stresses the inquiry about one or more individuals.
what people
Asks for the identification of particular persons involved.
FAQs
How do I use "who" in a sentence?
"Who" can be used as an interrogative pronoun to ask a question (e.g., "Who is that?") or as a relative pronoun to connect a clause to a noun (e.g., "The person "who helped me" was kind.").
When should I use "who" versus "whom"?
Use "who" when it functions as the subject of a verb (e.g., "Who is coming to the party?"). Use "whom" when it functions as the object of a verb or preposition (e.g., "To "whom did you give it"?").
What's a simple way to remember when to use "who"?
If you can replace "who" or "whom" with "he" or "she", use "who". If you can replace it with "him" or "her", use "whom". For example, "Who is there?" can be answered with "He is there".
Is it ever correct to start a sentence with "who"?
Yes, it is correct to start a sentence with "who" when asking a question, such as "Who are you?" or "Who is responsible for this?".
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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
94%
Authority and reliability
4.5/5
Expert rating
Real-world application tested