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
be the primary reason
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "be the primary reason" is correct and usable in written English.
You can use it when discussing the main cause or factor behind a particular situation or outcome. Example: "The lack of funding may be the primary reason for the project's delay."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
59 human-written examples
That appears to be the primary reason villagers were able to stay alive for weeks without aid.
News & Media
Personal communication in the form of e-mail and instant messaging continues to be the primary reason that more than a third of those Internet users log on.
News & Media
It could be the primary reason why so many plants may be looking or reacting quite differently this spring and summer.
News & Media
''The company feels a lot more connected,'' Raghunathan says, and this connection — rather than efficient decision-making — seems to be the primary reason for his enthusiasm about Slack.
News & Media
Sperm competition is thought to be the primary reason why males offer nuptial gifts (such as food) to females or allow females to cannibalize them.
Encyclopedias
Nor will lawmakers' qualms about breaching the First Amendment be the primary reason that the bills will languish, though there is considerable doubt about how much can be done constitutionally.
News & Media
His study and others suggest that tax shelters may be the primary reason for this difference, which is costing the government as much as $54 billion in taxes each year.
News & Media
It bears mentioning that the people who were hoping for a more nuanced approach probably voted for Senator John Kerry, and that Mr. Kerry's more nuanced approach may be the primary reason he lost the election.
News & Media
Better wages no longer seem to be the primary reason why Poles come to or stay in Britain (in terms of growth, the Polish economy is in a much better state than the British).
News & Media
But settling the dispute has been beyond reach, and recent charges of torture, rape and killing appear to be the primary reason public anger has not subsided, political analysts said.
News & Media
More than anything else, a paragraph on Page 2,129 of the Senate health care bill may be the primary reason Mr. Obama is now fighting for the survival of his top domestic priority.
News & Media
Expert writing Tips
Best practice
When using "be the primary reason", ensure that the context clearly supports this claim and that other contributing factors are appropriately acknowledged to maintain accuracy.
Common error
Avoid presenting "the primary reason" as the only reason. Acknowledge that situations often have multiple contributing factors, even if one is dominant. This strengthens your argument by showing balanced consideration.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "be the primary reason" functions as a predicate nominative, identifying the subject with the most important cause or justification. Ludwig AI supports this, providing multiple examples in various contexts where the phrase serves to pinpoint the main factor influencing a situation.
Frequent in
Science
39%
News & Media
37%
Encyclopedias
2%
Less common in
Wiki
2%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "be the primary reason" is a versatile phrase used to identify the main cause or justification for a particular situation. Ludwig AI confirms its grammatical correctness and frequent usage across diverse fields like science, news, and encyclopedias. While adaptable to various registers, ensuring contextual accuracy and acknowledging other contributing factors is key to effective communication. Alternatives such as "be the main reason" or "be the overriding reason" can provide nuanced options for expressing similar ideas.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
be the main reason
This is a more common and straightforward alternative indicating the principal cause.
be the major reason
This simply denotes a significant or prominent cause.
be the predominant reason
This emphasizes that the reason is the most common or noticeable one.
be the key reason
This underlines the importance of the reason as essential or crucial.
be the overriding reason
This alternative emphasizes that the reason is more important than others, acting as a final decisive factor.
be the fundamental reason
This highlights that the reason is a basic, underlying cause.
be the basic reason
This emphasizes the underlying nature of the reason, as the starting point or foundation.
be the primary cause
This focuses on the causal relationship, highlighting the initial factor that led to a certain result.
become the primary reason
This suggests a shift where something has recently turned into the main reason.
be the primary motive
This focuses on the underlying intention or goal behind an action.
FAQs
How can I use "be the primary reason" in a sentence?
You can use "be the primary reason" to explain the main cause or justification for something. For example, "The lack of funding may "be the primary reason" for the project's delay".
What can I say instead of "be the primary reason"?
You can use alternatives like "be the main cause", "be the chief factor", or "be the overriding reason" depending on the context.
Is it correct to say "is the primary reason" or "is a primary reason"?
Both are grammatically correct, but "is the primary reason" implies that it's the most important reason, while "is a primary reason" suggests it's one of several important reasons. The choice depends on the context and the emphasis you want to convey.
What is the difference between "be the primary reason" and "be the result of"?
"Be the primary reason" explains the cause of something, while "be the result of" describes the effect or outcome. For example, "Low sales were the primary reason for the store closing" (cause), versus "The store closing was the result of low sales" (effect).
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
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested