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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
someone else's
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "someone else's" is correct and usable in written English.
It is used to emphasize that something belongs or pertains to someone else in particular and not to you. For example, "I don't want to borrow someone else's pencil; I want to use my own."
✓ Grammatically correct
News & Media
Wiki
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
It was someone else's money.
News & Media
Someone grabbed someone else's pennies.
News & Media
"We were someone else's kids.
News & Media
Laugh at someone else's jokes.
News & Media
It is someone else's idyll.
News & Media
For someone else's team.
News & Media
In someone else's house.
News & Media
First review someone else's proposal.
Science & Research
"They'd licensed someone else's technology.
News & Media
Projecting: putting yourself in someone else's shoes.
Science
Someone else's bad behavior.
News & Media
Expert writing Tips
Best practice
In collaborative projects, use "someone else's" to define boundaries and responsibilities, ensuring that each member understands their role and contributions relative to others.
Common error
Avoid using "someone else's" vaguely. Always clarify who 'someone else' is, especially in professional or academic contexts. Unclear attribution can lead to confusion and disputes over intellectual property or responsibility.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "someone else's" functions as a possessive determiner. It modifies a noun to indicate that the noun belongs to or is associated with a person other than the speaker or the primary subject. As Ludwig AI points out, this phrase is grammatically correct and widely used.
Frequent in
News & Media
40%
Wiki
30%
Science
15%
Less common in
Formal & Business
5%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
In summary, "someone else's" is a commonly used and grammatically correct possessive phrase that indicates ownership or association with an individual other than oneself. As indicated by Ludwig AI, this phrase is widely accepted and appears frequently in various contexts, particularly in news, media, and general writing. It's important to use it accurately to give credit where it's due and avoid any confusion about ownership or responsibility. While alternatives exist, "someone else's" provides a clear and straightforward way to express this concept.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
Somebody else's
Uses "somebody" instead of "someone", offering a slight variation in wording with similar meaning.
Another person's
Replaces "someone" with "another person" for a more formal tone.
A different person's
Emphasizes the difference in person, highlighting that it's not just any 'someone' but a 'different person'.
Belonging to another
Focuses on the act of belonging, making it clear that the item or concept is owned by someone else.
Not my own
Contrasts directly with "my own", indicating something belonging to anyone but the speaker.
Not one's own
Similar to 'not my own' but more general, applicable to anyone.
In another's possession
Highlights the possessive aspect, suggesting that something is held or owned by someone else.
From an outside source
Shifts the focus from person to source, useful when the origin is more important than the owner.
Attributable to another
More formal, suitable when discussing ideas or work rather than physical possessions.
Someone's else
An ungrammatical version of the phrase
FAQs
How do I properly use "someone else's" in a sentence?
Use "someone else's" to show possession by a person who is not you. For example, "That's "someone else's coat"", indicating the coat belongs to another person.
What are some alternatives to using "someone else's"?
Depending on the context, you could use phrases like "another person's", "somebody else's", or "not my own" to convey a similar meaning.
Is it correct to say "someones else's" instead of "someone else's"?
No, "someones else's" is grammatically incorrect. The correct possessive form is "someone else's", where the apostrophe indicates possession by "someone else".
How does "someone else's" differ from "other people's"?
"Someone else's" refers to a single, unspecified individual, while "other people's" refers to multiple individuals. The choice depends on whether you are referring to one specific person or a group.
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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
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested