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Justyna Jupowicz-Kozak quote

Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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I couldn't determine

Grammar usage guide and real-world examples

Human-verified examples from authoritative sources

Exact Expressions

7 human-written examples

After a single viewing, I couldn't determine Mr. Malick's attitude toward religious faith.

News & Media

The New York Times

Yet I couldn't determine where theoretical extremity ended and individual experience began.

I couldn't determine the ingredients of their chicken nuggets (no one can, apparently) so I did my own version, using actual coal nuggets flavoured with bergamot and hydrochloric acid and it works really well.

News & Media

Independent

I couldn't determine if the writer of "Keep Your New Age Cyberjock, and Send Me a Handsome Handyman" (April 2) was motivated by lust or was indifferent to her lack of knowledge.

Another commenter, now living in New York, describes her Cageian revelation while living in Cape Breton, Nova Scotia: I vividly remember for the first few days there was a sound that was driving me insane because it wouldn't stop and I couldn't determine its source.

News & Media

The New York Times

She alluded to using again; I couldn't determine if she meant she was or not.

News & Media

Huffington Post
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Human-verified similar examples from authoritative sources

Similar Expressions

47 human-written examples

At that moment, in my haze of vainglory, I could not determine a single personal deficit.

I could not determine how Henrick fitted into the Icke camp.

His eyes were alight with a strong emotion of some sort, but I could not determine which.

News & Media

The New Yorker

For reasons I could not determine, Steven -- who would not give his last name, perhaps because of fire codes -- had affixed a lighted candle to the top of his bald head, like one of the singing incendiaries in "Beauty and the Beast".

News & Media

The New York Times

While this works in theory, and I was able to upload a zipped folder with multiple files, Fluxiom did not automatically unzip the folder and I could not determine a way to do it with the service.

News & Media

TechCrunch
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Expert writing Tips

Best practice

Use "I couldn't determine" to signal a professional boundary where evidence was insufficient to reach a conclusion. It is more objective than saying "I didn't know".

Common error

Do not use "I couldn't determine" when you actually mean "I couldn't decide". The word "determine" implies a search for an objective fact or truth, whereas "decide" refers to a personal choice or preference.

Antonio Rotolo, PhD - Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

93%

Authority and reliability

4.9/5

Expert rating

Real-world application tested

Linguistic Context

This phrase functions as a declarative statement utilizing the modal verb "could" in its negative past form to express a lack of ability or success. According to Ludwig, it serves to report the result of an inquiry where no definitive answer was found.

Expression frequency: Uncommon

Frequent in

News & Media

55%

Science

30%

Formal & Business

15%

Less common in

Social Media

5%

Informal Speech

10%

Encyclopedias

5%

Ludwig's WRAP-UP

The phrase "I couldn't determine" is a powerful tool for writers who need to express a lack of certainty without sounding uninformed. Ludwig AI shows that this expression is highly prevalent in investigative journalism and scientific research, where it acts as a marker of methodological rigor. By stating that you "couldn't determine" something, you imply that an effort was made, but the available data did not support a clear conclusion. While "I could not determine" is preferred for purely academic contexts, the contracted form is the standard for high-quality news and professional reports.

FAQs

How do I use "I couldn't determine" in a sentence?

You can use it to describe a failed attempt to find information, such as: "After reviewing the data, "I couldn't determine" the exact cause of the system failure."

Is it better to use "I couldn't determine" or "I could not determine"?

In formal writing or academic papers, use "I could not determine". In journalism or professional emails, the contraction "I couldn't determine" is perfectly acceptable.

What is a more informal way to say "I couldn't determine"?

A common informal alternative is "I couldn't figure out" or simply "I wasn't sure".

When should I use "ascertain" instead of "determine"?

Use "I couldn't ascertain" when you want to emphasize the difficulty of getting definite information in a very formal context.

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Source & Trust

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Authority and reliability

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Expert rating

Real-world application tested

Most frequent sentences: