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
reason is that
Grammar usage guide and real-world examplesUSAGE SUMMARY
"reason is that" is a correct and usable phrase in written English.
You can use this phrase to introduce a statement or explanation that follows. For example, "The reason is that I don't have the necessary qualifications for the job."
✓ Grammatically correct
News & Media
Science
Formal & Business
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
One reason is that political risk abounds.
News & Media
One reason is that cuts aggravate recession.
News & Media
One reason is that sex is shocking.
News & Media
One reason is that Labour has changed tack.
News & Media
The reason is that pockets of Spain are extremely competitive.
News & Media
One reason is that Cups take place rather irregularly.
News & Media
The reason is that financial institution stocks are performing dismally.
News & Media
The second reason is that Mercosur is drifting.
News & Media
One reason is that technology has made home-education easier.
News & Media
Part of the reason is that bicycling is so ubiquitous.
News & Media
Another big reason is that Pinterest is visual.
News & Media
Expert writing Tips
Best practice
Use "reason is that" to clearly introduce an explanation, ensuring the connection between the statement and its justification is evident.
Common error
Avoid using "reason is that" in very simple sentences where a direct "because" or "since" would be more concise and effective. For example, instead of "The reason is that I was tired", say "I was tired because..."
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "reason is that" functions as a causal connector, explicitly linking a statement with its justification. This introductory phrase sets the stage for an explanation. Ludwig's examples show this phrase is consistently used to introduce explanations across varied contexts.
Frequent in
News & Media
68%
Science
14%
Formal & Business
6%
Less common in
Wiki
3%
Encyclopedias
1%
Reference
1%
Ludwig's WRAP-UP
In summary, the phrase "reason is that" serves as a common and grammatically sound method for introducing explanations. Ludwig AI confirms its correctness and provides numerous examples showcasing its use across various fields, particularly in news, science, and business. While versatile, it is best used to clearly and effectively connect a statement with its underlying cause or justification. Consider more concise options like "because" for simpler sentences to avoid unnecessary wordiness.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
the explanation is that
This alternative directly replaces "reason" with "explanation", maintaining a similar level of formality and meaning.
the cause is that
Substitutes "reason" with "cause", focusing on the origin or source of something.
the justification is that
Replaces "reason" with "justification", emphasizing the defense or rationale behind an action or decision.
the motive is that
Focuses on the underlying motivation or purpose behind something.
the basis is that
Highlights the foundation or underlying principle.
the rationale is that
Emphasizes the logical or reasoned explanation.
it stems from the fact that
Indicates that something originates or derives from a particular fact.
it is attributable to the fact that
Points to a specific fact as the cause or origin.
this is due to the fact that
Similar to 'because of', but slightly more formal.
the underlying factor is that
Highlights a less obvious but influential reason.
FAQs
How can I use "reason is that" in a sentence?
Use "reason is that" to introduce an explanation or justification following a statement. For instance, "The project was delayed. The "reason is that" we encountered unexpected technical difficulties."
What are some alternatives to "reason is that"?
Alternatives include phrases like "the explanation is that", "the cause is that", or simply using "because". The best choice depends on the specific context and desired level of formality.
Is it grammatically correct to start a sentence with "reason is that"?
While grammatically correct, starting a sentence directly with "reason is that" can sometimes sound awkward. It's often better to introduce the topic or situation first, then follow with the "reason is that" clause.
What's the difference between "reason is that" and "because"?
"Because" is a more direct and concise way to express cause and effect. "Reason is that" is generally used to introduce a more detailed or formal explanation. Using "because" is often more suitable for simple sentences, while "reason is that" can provide clarity in complex situations.
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
4.5/5
Expert rating
Real-world application tested