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
had once been
Grammar usage guide and real-world examplesUSAGE SUMMARY
"had once been" is a perfectly valid phrase to use in written English.
You can use it to refer to something that occurred in the past, but is no longer the case. For example, "The once-thriving downtown area had once been a vibrant hub of activity."
✓ Grammatically correct
News & Media
Alternative expressions(20)
had once been a hotel
used to be
was formerly
previously was
was at one time
in the past was
once existed as
had yet been
had therefore been
had formerly been
had later been
had simultaneously been
had then been
had occasionally been
had only been
had soon been
had sometimes been
had definitively been
had still been
had now been
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
Antarctica had once been warm.
News & Media
(Green had once been chairman).
News & Media
These conditions had once been uniformly fatal.
News & Media
Macdonald had once been such a cat.
News & Media
The building had once been a hotel.
News & Media
This ice had once been rainwater.
News & Media
Sir Garfield had once been his teacher.
News & Media
It had once been a mill town.
News & Media
He had once been their neighbor.
News & Media
Wilson had once been rich.
News & Media
It had once been a caretaker's cabin.
News & Media
Expert writing Tips
Best practice
Use "had once been" to effectively contrast a past state with a current one, adding depth to your writing by highlighting change over time.
Common error
Avoid using "had once been" when simply describing a past state without implying a change. In such cases, "was" or "used to be" might be more appropriate.
Source & Trust
94%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "had once been" functions as a past perfect construction, indicating a state or condition that existed at some point in the past before another past action or time. As Ludwig AI explains, it highlights a situation that is no longer current.
Frequent in
News & Media
100%
Less common in
Formal & Business
0%
Science
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "had once been" is a versatile past perfect construction used to highlight contrasts between past and present states. As Ludwig AI confirms, it is grammatically correct and commonly found in News & Media contexts. When writing, use "had once been" to effectively showcase transformations and avoid it when simply describing past states without implying a change. Alternatives like "used to be" and "was formerly" offer similar meanings depending on the nuance you aim to convey.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
used to be
This is a direct synonym, indicating a past state or condition that is no longer true.
was formerly
Highlights a previous state or role with a more formal tone.
previously was
Similar to "was formerly" but slightly less formal.
was at one time
Emphasizes a point in the past when something was different.
in the past was
Directly indicates a past state, suitable for simple comparisons.
once existed as
Focuses on the past existence of something, implying a change in form or nature.
earlier had been
Emphasizes that something was in a certain state at an earlier point.
has since transformed
Highlights that a transformation has occurred since a previous state.
prior to that was
Indicates a condition before a specific event or time.
before that had been
Similar to "prior to that was" with a slightly more complex structure.
FAQs
How to use "had once been" in a sentence?
Use "had once been" to describe something that existed or was true in the past but is no longer the case. For example, "The building "had once been a hotel"".
What can I say instead of "had once been"?
You can use alternatives like "used to be", "was formerly", or "was at one time depending on the context".
Which is correct, "had once been" or "was once been"?
"Had once been" is correct. The auxiliary verb "had" is necessary to form the past perfect tense, indicating that the action was completed before a certain point in the past. "Was once been" is grammatically incorrect.
What's the difference between "used to be" and "had once been"?
"Used to be" describes a past state or habit, while "had once been" typically emphasizes a transformation or change from a previous state. "Had once been" often implies a contrast with the present.
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
94%
Authority and reliability
4.6/5
Expert rating
Real-world application tested