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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
have once been
Grammar usage guide and real-world examplesUSAGE SUMMARY
"have once been" is a correct and usable phrase in written English.
It is usually used in the past tense to describe something that used to be true or exist, but is no longer true or in existence. Example sentence: I have once been a professional dancer, but now I work as a lawyer.
✓ Grammatically correct
News & Media
Wiki
Formal & Business
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
Such a declaration would have once been heresy here.
News & Media
A tough article like that would have once been unimaginable.
News & Media
It is difficult when you have once been an owner".
News & Media
Earlier testimony suggested that her son may have once been on familiar terms with Mr. Santiago.
News & Media
A shriveled-up chunk of what may have once been a watermelon.
News & Media
It's odd to think how I could have once been so physically excited by you.
News & Media
New Yorkers now beheld what would have once been incomprehensible: the empty harbor.
News & Media
Traces of a timber structure thought to have once been a church have also been found.
News & Media
It is a claim that would have once been dismissed as a pipe dream.
News & Media
Mattias claimed to have once been a free-market economist in Buenos Aires.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
Improvements in acute burn care have enabled patients to survive massive burns that would have once been fatal.
Science
Expert writing Tips
Best practice
Use "have once been" to clearly indicate a change in state or condition over time, providing context about a past situation that is no longer current.
Common error
Avoid using "have once been" when a simple past tense verb would suffice. For example, instead of saying 'The building might "have once been" a theatre,' it's often clearer to say 'The building was once a theatre.'
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "have once been" functions as a verb phrase in the present perfect tense, indicating a state or condition that existed at some point in the past but is no longer true. As Ludwig AI confirms, it’s grammatically correct. Examples from Ludwig show its usage in describing past states of objects, places, or people.
Frequent in
News & Media
88%
Wiki
7%
Formal & Business
2%
Less common in
Science
2%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "have once been" is a grammatically sound and frequently used expression to describe past states or conditions that are no longer true. As Ludwig AI confirms, it's correct in written English. It is most commonly found in news and media contexts, though it appears in various other forms of writing as well. When using this phrase, it's essential to ensure it accurately reflects a transformation or change over time and isn't used redundantly when a simple past tense would suffice. Alternatives include "used to be" or "was formerly", but the best choice will depend on the specific nuance you wish to convey.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
used to be
This alternative is a more direct and simpler way to express a past state.
was formerly
This alternative is slightly more formal and emphasizes a previous official status.
had previously been
This alternative emphasizes the sequence of events, highlighting that something was in a certain state before another event occurred.
once existed as
This alternative emphasizes the past existence of something in a particular form.
at one time was
This alternative places emphasis on a specific period in the past.
in the past was
This alternative simply states that something was true in the past.
is no longer
This alternative focuses on the current absence of something that existed before.
has since changed from
This alternative focuses on the transformation from a previous state.
did at one point consist of
This alternative specifies a component of something at a certain time.
earlier comprised
This alternative stresses the composition of something in a former state.
FAQs
How can I use "have once been" in a sentence?
Use "have once been" to describe something that existed or was true in the past, but is no longer so. For instance, "That restaurant may "have once been" a bookstore".
What's the difference between "have once been" and "used to be"?
"Have once been" emphasizes a specific point in the past, while "used to be" describes a habitual or continuous state in the past. Both indicate a change from a past condition.
Which is correct, "have once been" or "had once been"?
"Have once been" is generally used in present perfect constructions while "had once been" is used in past perfect constructions. The choice depends on the timeline you're establishing in your sentence.
What can I say instead of "have once been"?
You can use alternatives like "used to be", "was formerly", or "had previously been" depending on the nuance you want to convey.
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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