Used and loved by millions
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
one reason that
Grammar usage guide and real-world examplesUSAGE SUMMARY
"one reason that" is correct and usable in written English.
You can use it to introduce a particular cause or justification for something. For example, "One reason that I enjoy working at this company is the supportive environment."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(15)
a contributing factor is that
partly because
one of the reasons to
the basis for this is
one of the reasons that
this explains why
one reason for this is
this accounts for
one of the reason why
the rationale behind this is
this stems from
one of the reason for this
one of the reasons being
a contributing factor is
one of the reasons why
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
This is one reason that reading Trilling remains so unsettling.
News & Media
Plasmin deficiency is one reason that leads to thrombosis due to insufficient clots degradation.
Science
One reason that could be speculated for this result is the increase in rural urban migration.
Science
One reason that so many people become infected each year is that this virus evolves rapidly.
Science
One reason that American kids relate so well to….
News & Media
And one reason that surge was so high?
News & Media
And that is one reason that I am here".
News & Media
Which is one reason that discontented researchers loved Mendeley.
News & Media
One reason that Indian newspapers thrive is the absence of digital competition.
News & Media
One reason that we eat processed foods is the decline of home economics.
News & Media
One reason that it is misunderstood is that the wrong term is used.
News & Media
Expert writing Tips
Best practice
When using "one reason that", ensure the sentence clearly states the outcome or situation being explained. For example, "One reason that sales increased was the new marketing campaign."
Common error
Avoid using "one reason that" without fully explaining the context or providing sufficient detail. For example, instead of saying "One reason that things went wrong was lack of communication", provide more specific examples of the communication breakdown.
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "one reason that" functions as a causal connector, introducing a specific explanation or justification. According to Ludwig, it's a correct and usable phrase in written English, used to specify a particular cause.
Frequent in
News & Media
53%
Science
35%
Wiki
5%
Less common in
Formal & Business
2%
Encyclopedias
0%
Academia
0%
Ludwig's WRAP-UP
In summary, "one reason that" is a frequently used and grammatically sound phrase that introduces a specific explanation or cause. As Ludwig AI confirms, its purpose is to clarify why something is the way it is, making it a valuable tool for constructing clear and informative sentences. Predominantly found in news and media, and science, this phrase maintains a neutral register, suitable for various professional contexts. Remember to fully explain the context when using it and avoid vague statements to maximize clarity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
one cause that
Replaces "reason" with a direct synonym, emphasizing causality.
one factor that
Substitutes "reason" with "factor", highlighting a contributing element.
one explanation that
Focuses on providing a clear account or justification.
one motive that
Emphasizes the underlying impetus or drive.
one consideration that
Highlights a specific point to be taken into account.
one argument that
Frames the reason as a point made in support of a claim.
one basis that
Indicates a foundation or justification for something.
a contributing factor is that
Expands the phrase to include "contributing factor", offering a more detailed explanation.
a primary cause is that
Highlights the main cause or reason.
partly because
Offers a partial explanation, indicating the reason is not the only factor.
FAQs
How to use "one reason that" in a sentence?
Use "one reason that" to introduce a specific cause or justification for something. For example: "One reason that I prefer coffee is its energizing effect."
What can I say instead of "one reason that"?
You can use alternatives like "one cause that", "one factor that", or "one explanation that" depending on the context.
Which is correct, "one reason that" or "the reason is that"?
Both phrases are grammatically correct. "One reason that" is generally used to introduce one of several possible reasons, while "the reason is that" implies it's the primary or sole reason.
What's the difference between "one reason that" and "because"?
"One reason that" introduces a more formal and detailed explanation, whereas "because" is a simpler and more direct way to indicate causality. Using "One reason that" often sets up a more elaborate discussion of the causes.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested