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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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when I knew

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "when I knew" is correct and usable in written English.
You can use it to refer to a specific moment in the past when you gained knowledge or awareness about something. Example: "I remember the day clearly, when I knew that I wanted to pursue a career in medicine."

✓ Grammatically correct

News & Media

Human-verified examples from authoritative sources

Exact Expressions

56 human-written examples

"And that's when I knew".

News & Media

The New York Times

That's when I knew.

There were years when I knew.

News & Media

The New Yorker

"That's when I knew I'd got it".

News & Media

The New York Times

"That's when I knew things were serious".

News & Media

Independent

That's when I knew something was bad.

News & Media

The New York Times

"That's when I knew it was working".

News & Media

The Guardian

"That's when I knew things were changing".

News & Media

The New York Times

That's when I knew something was wrong".

News & Media

The New York Times

"That's when I knew what I needed.

News & Media

The Guardian

That's when I knew this was serious.

News & Media

The New Yorker
Show more...

Expert writing Tips

Best practice

Combine "when I knew" with vivid sensory details to enhance the reader's experience and create a more memorable impact.

Common error

Avoid using "when I knew" if the focus is not on the moment of realization but on something else entirely. Reframe the sentence to better highlight the intended subject.

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

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

89%

Authority and reliability

4.6/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "when I knew" functions as a subordinate conjunction introducing an adverbial clause of time. This clause specifies the moment at which the speaker gained knowledge or understanding. Ludwig examples illustrate diverse contexts where this temporal marker is used to frame a past event.

Expression frequency: Very common

Frequent in

News & Media

100%

Less common in

Science

0%

Formal & Business

0%

Science

0%

Ludwig's WRAP-UP

In summary, the phrase "when I knew" serves as a common and grammatically sound method for indicating a moment of realization or understanding. As affirmed by Ludwig AI, this phrase is correct and usable in written English across various contexts, particularly in news and media. While alternative phrases exist, "when I knew" remains a clear and direct way to establish a temporal relationship in narratives. Pay attention to context to ensure the intended emphasis and to select the most appropriate phrasing.

FAQs

How can I use "when I knew" in a sentence?

You can use "when I knew" to introduce a clause that specifies the moment you became aware of something. For example: "That's "when I knew" I had to make a change."

What can I say instead of "when I knew"?

Alternatives include "the moment I realized", "as soon as I became aware", or "upon recognizing", depending on the specific nuance you want to convey.

Is there a more formal way to express "when I knew"?

Yes, phrases like "upon recognizing" or "once I discerned" offer a more formal tone compared to ""when I knew"".

What's the difference between "when I realized" and "when I knew"?

While similar, "when I realized" often implies a gradual understanding, whereas ""when I knew"" can suggest a more immediate or certain awareness. The choice depends on the specific context.

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Source & Trust

89%

Authority and reliability

4.6/5

Expert rating

Real-world application tested

Most frequent sentences: