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
when it occurred
Grammar usage guide and real-world examplesUSAGE SUMMARY
"when it occurred" is a grammatically correct and usable phrase in written English.
You can use it when speaking of something that has already happened in the past, in order to describe the timing of the event. For example: "I was surprised when it occurred to me that I had never seen a sunrise."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(20)
took place
occurred
as it transpired
at its inception
wherever it occurred
where it occurred
however it occurred
after it occurred
when it hit
when it was
when it went by
is occured
where that was
where it happened
where it was
location of the event
place where it happened
when it happened
where it originated
its original location
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
58 human-written examples
The subsidence reached its most critical state in the early 1980s when it occurred at a rate as high as 120 mm/year.
Science
"That's when it occurred.
News & Media
And that's when it occurred to me.
News & Media
Unfortunately the explosion, when it occurred, had only one victim.
News & Media
That's when it occurred to me that Nina's father was not a hippy.
News & Media
Even Detroit players looked concerned when it occurred and signaled the Giants' bench for medical help.
News & Media
That's when it occurred to me that maybe, in their own gentle way, they actually had.
News & Media
When it occurred again on a frigid day in Michigan, I blamed the cold.
News & Media
That's when it occurred to him that "prohibition" was the true enemy.
News & Media
I learned to cope by always trying to talk to or greet someone when it occurred.
News & Media
Armenian resistance, when it occurred, provided the authorities with a pretext for employing harsher measures.
Encyclopedias
Expert writing Tips
Best practice
Consider the formality of your writing. While "when it occurred" is generally acceptable in most contexts, more formal settings might benefit from alternatives like "at the time of its occurrence".
Common error
Avoid using "when it occurred" in sentences where the timing is already clear. Overuse can make your writing sound repetitive and less concise. Ensure that the phrase adds value by clarifying the specific moment or conditions of the event.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "when it occurred" functions as an adverbial clause, modifying a main clause by providing information about the timing or circumstances of an event. As Ludwig AI points out, this phrase is grammatically correct and usable in written English.
Frequent in
News & Media
39%
Science
38%
Encyclopedias
2%
Less common in
Formal & Business
0%
Social Media
0%
Academia
0%
Ludwig's WRAP-UP
In summary, "when it occurred" is a versatile phrase used to specify the timing and circumstances of past events. Ludwig AI confirms its grammatical correctness and usability. It is commonly found in news, scientific writing, and encyclopedias. While generally neutral in tone, more formal contexts may benefit from alternative phrasing. The phrase serves to provide temporal context, helping readers understand the sequence of events. Common errors include redundant usage, so use it judiciously to enhance clarity rather than clutter your writing. Remember, "when it occurred" is most effective when it adds meaningful context to the narrative.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
the moment it took place
Substitutes "occurred" with "took place", focusing on the action.
at the time of its occurrence
Replaces "when" with "at the time of" for a more formal tone.
on the occasion it happened
Emphasizes a specific instance or event.
as it transpired
Indicates the event became known or proved to be the case.
upon its happening
Changes the structure to emphasize the moment of happening.
when it arose
Uses "arose" to indicate the event came into existence or began.
during its unfolding
Highlights the process or development of the event.
when it came about
Uses "came about" as a more informal synonym for "occurred".
at its emergence
Focuses on the event's initial appearance or rise.
at its inception
Focuses on the beginning or start of the event.
FAQs
How can I rephrase "when it occurred" for a more formal tone?
For a more formal tone, you could use phrases such as "at the time of its occurrence" or "upon its happening". These alternatives provide a more elevated and sophisticated style, suitable for academic or professional writing.
What are some synonyms for "occurred" that I can use with "when it"?
Instead of "occurred", you could use verbs like "happened", "took place", or "arose". For example, you can say "when it happened" or "when it "took place"".
Is it ever incorrect to use the phrase "when it occurred"?
While grammatically correct, overuse or redundant use of "when it occurred" can make your writing sound clunky. Ensure the phrase adds clarity or context rather than simply restating the obvious.
How does "when it occurred" differ from "after it occurred"?
"When it occurred" specifies the timing or circumstances concurrent with an event, whereas "after it "occurred"" indicates a point in time following the event. The former focuses on the event itself, while the latter focuses on what happened subsequently.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested