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
could not explained
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "could not explained" is not correct in English.
The correct form would be "could not explain." You can use the correct form when indicating an inability to clarify or provide an explanation for something. Example: "Despite my best efforts, I could not explain why the project failed."
⚠ May contain grammatical issues
Science
News & Media
Alternative expressions(3)
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
4 human-written examples
"This is something that any responsible real estate manager in the private sector is able to do, but for too many years we could not," explained Tangherlini, using the IRS parking lot in Georgia as a prime example.
News & Media
The increase in insulin resistance could not explained by weight gain or alterations in lipid levels.
Science
The extent of articulation of integration in concept maps could not explained by motivation, nor by the value participants attached to the procedure and the instructions.
Science
The analyzed maps were mostly derived from crosses of the North-American Apis mellifera population which represents an admixture of several ancestral populations [ 28] and overall similarities in the recombinational landscapes could not explained by ancestry alone [ 29].
Science
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
She could not explain it.
News & Media
Nutrition could not explain it.
News & Media
She could not explain, she said.
News & Media
Mr. Ledet could not explain it.
News & Media
She could not explain his criminal past.
News & Media
Others could not explain the contradiction.
News & Media
I could not explain that.
News & Media
Expert writing Tips
Best practice
Always use the correct grammatical form, which is "could not explain", when indicating an inability to clarify or provide an explanation for something. For example: "Despite my best efforts, I "could not explain" why the project failed."
Common error
Avoid using the past participle form ("explained") directly after "could not". The correct structure requires the base form of the verb: "could not explain".
Source & Trust
78%
Authority and reliability
1.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "could not explained" attempts to express an inability to provide a reason or clarification. However, it is grammatically incorrect. According to Ludwig AI, the correct form is "could not explain". The grammatical structure is a modal verb ("could") followed by a negative particle ("not") and the base form of the verb.
Frequent in
Science
50%
News & Media
50%
Formal & Business
0%
Less common in
Academia
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "could not explained" is a grammatically incorrect construction. The correct form is "could not explain". This mistake appears in a limited number of sources, as shown by Ludwig. Ludwig AI confirms that the correct usage involves using the base form of the verb after the modal verb "could" and the negative particle "not". While the intended meaning – an inability to clarify or understand something – may be clear, using the correct grammatical form enhances clarity and credibility. To avoid this error, remember to always use the base form of the verb after "could not". Alternatives such as "was unable to explain" or "could not clarify" can also be used depending on the context.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
was unable to explain
Rephrases the sentence to use "was unable", providing a more grammatically correct structure.
could not clarify
Replaces "explained" with "clarify", which has a similar meaning but emphasizes making something clearer.
could not offer an explanation
Emphasizes the absence of an explanation.
could not make clear
Focuses on the lack of clarity achieved.
was at a loss to explain
Expresses a state of confusion and inability to explain.
could not elucidate
Uses a more formal synonym for explain, emphasizing a thorough explanation.
explanation remained elusive
Shifts the focus to the explanation itself being unattainable.
could not provide details
Highlights the inability to give specific information.
could not shed light on
Uses a metaphorical expression to convey the inability to clarify.
could not account for
Indicates an inability to provide a reason or justification for something.
FAQs
How to correct the phrase "could not explained"?
The correct form is ""could not explain"". The modal verb "could" requires the base form of the verb, not the past participle.
What does it mean when someone says they "could not explain" something?
It means they were unable to provide a clear reason, justification, or understanding of a particular situation or event. You might also say they "were unable to explain".
Are there synonyms for "could not explain" that I can use?
Yes, you can use phrases like "could not clarify", "could not elucidate", or "could not account for" depending on the context.
Is "could not explained" ever correct in English?
No, "could not explained" is grammatically incorrect. The correct form is always ""could not explain"".
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
78%
Authority and reliability
1.8/5
Expert rating
Real-world application tested