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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
in their
Grammar usage guide and real-world examplesUSAGE SUMMARY
"in their" is correct and can be used in written English.
Example: He watched the children play in their backyard.
✓ Grammatically correct
News & Media
Wiki
Alternative expressions(4)
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
In their Sunday best.
News & Media
Putty in their hands".
News & Media
"But in their condition.
News & Media
In their faint photographs.
News & Media
levels in their bloodstreams.
News & Media
"Stuck in their ways".
News & Media
All in their sixties.
News & Media
It's in their blood.
News & Media
You're in their way.
News & Media
Scrapple in their helmets?
News & Media
Certainly in their neighborhood.
News & Media
Expert writing Tips
Best practice
Ensure clarity by specifying the referent of "their" to avoid ambiguity. For example, instead of "The team celebrated in their way", specify "The team celebrated in their unique way".
Common error
Avoid using "in their" when referring to a singular subject. For example, instead of "Each student should bring "in their" own lunch," use "Each student should bring his or her own lunch" or, better yet, "All students should bring "in their" own lunches."
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "in their" primarily functions as a prepositional phrase indicating location, condition, or association. Ludwig AI confirms this usage is grammatically correct, supporting its role in specifying circumstances related to a group.
Frequent in
News & Media
55%
Wiki
20%
Formal & Business
10%
Less common in
Science
5%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
In summary, "in their" is a versatile and grammatically sound prepositional phrase widely used to denote location, condition, or association with a group. Ludwig AI confirms its grammatical correctness, and its prevalence across various sources—particularly in News & Media and Wiki—underscores its broad applicability. Pay attention to clarity by ensuring the antecedent of "their" is clear and unambiguous. Avoid the common error of using "in their" with singular subjects. By following these guidelines, you can effectively and accurately incorporate "in their" into your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
within their
Emphasizes containment or enclosure more strongly than "in their".
inside their
Indicates physical containment or being enclosed by something.
among their
Suggests being included as part of a group or collection belonging to them.
belonging to them
Replaces the prepositional phrase with a participial phrase, highlighting ownership.
as part of their
Highlights that something is a component or element of their collective entity.
in the midst of their
Suggests being surrounded by or deeply involved in something that belongs to them.
under their
Implies a position of subordination, authority or influence.
according to them
Indicates something is viewed or understood from their perspective or based on their information.
from their perspective
Focuses on their point of view or how they perceive something.
on their part
Emphasizes an action, responsibility, or characteristic originating from them.
FAQs
How can I use "in their" correctly in a sentence?
Use "in their" to indicate that something belongs to or is associated with a group of people or things that have already been mentioned. For example, "The students expressed pride "in their" accomplishments."
What is the difference between "in their" and "in its"?
"In their" is used for plural possessive pronouns, referring to something belonging to multiple entities. "In its" is used for singular possessive pronouns, when something belongs to a single entity. For example, "The students showed creativity "in their" projects" versus "The company invested heavily "in its" infrastructure."
Are there formal alternatives to using "in their"?
While "in their" is perfectly acceptable in most contexts, for more formal writing, consider rephrasing to avoid pronouns altogether. For instance, instead of "The researchers published "in their" journals," you could say, "The researchers published in academic journals."
What are some common phrases that include "in their"?
Common phrases include "in their opinion", "in their view", "in their spare time", and "in their own way". Each of these indicates a perspective, activity, or manner that is specific to the group being referenced. You can find some possible alternatives "according to them", "from their perspective" and "on their part".
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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
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested