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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
there are once
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "there are once" is not correct and does not make sense in written English.
It cannot be used in any context as it stands, as it combines a plural form with a singular adverb inappropriately. Example: "There are once a time when people believed in magic." (This is incorrect.)
⚠ May contain grammatical issues
News & Media
Wiki
Science
Alternative expressions(20)
there was a time
there used to be
once there was
there was
once there were
in the past there were
at one time there were
there have been times
there are sometimes
there are already
the future holds more
there are quite
there are yet
yet to be seen
there still remains
there are still
there are only
there still exist
yet to be done
there continue to be
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
19 human-written examples
"But it's amazing how many piers there are, once you start adding them all up.
News & Media
At a time when South Africa's mines, and the conditions of those who work there, are once more in the news, he explains what inspired On the Mines, and his thoughts on the tragic shootings at Lonmin's Marikana mine.
News & Media
Sexual games such as spin the bottle or strip poker can be fun at the time, but always remember there are, once again, possibilities that this could turn out to ruin the night.
Wiki
There are once again lots of buses and bus stations.
News & Media
One of her theories is that there are (once again) two kinds of people when it comes to intelligence.
News & Media
As a result, people who were working from home are being told there are once again desks for them at the office.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
40 human-written examples
There are once-abstract experiences, like being stung by a bee, that suddenly bring real pain.
News & Media
Then there are once-a-week programs that do not constitute a full-fledged alternative to summer camp, but are more affordable and can give children a change of scenery.
News & Media
"There are once-in-a-lifetime deals that come your way.
News & Media
There was, once again, serious violence.
News & Media
"There Was Once... ...... serves that function precisely.
News & Media
Expert writing Tips
Best practice
Prefer using "there was once" for singular subjects or "there used to be" to indicate something existed in the past but no longer does. This ensures grammatical correctness and clarity.
Common error
Do not use "there are" with "once" because "once" implies a singular instance. Instead, use "there was once" for singular instances or rephrase to avoid the error altogether.
Source & Trust
88%
Authority and reliability
1.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "there are once" is intended to introduce a past event or state, but its grammatical structure is incorrect. Ludwig AI confirms its incorrectness, suggesting alternatives such as "there was once". While the intent might be to narrate a past scenario, the form is non-standard.
Frequent in
News & Media
33%
Wiki
33%
Science
33%
Less common in
Formal & Business
0%
Academia
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, the phrase "there are once" is grammatically incorrect and should be avoided in formal writing. As Ludwig AI points out, the phrase incorrectly combines plural and singular forms. While it appears infrequently across News & Media, Wiki, and Science sources, opting for grammatically correct alternatives such as "there was once" or "there used to be" ensures clarity and correctness. Utilizing these alternatives enhances the quality and precision of your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
there was once
Changes plural "are" to singular "was", making it grammatically correct for a singular event in the past.
once there were
Reverses the order for emphasis, but still describes a past situation. More suitable in storytelling contexts.
there used to be
Implies that something existed in the past but no longer does. Focuses on discontinued existence.
in the past there were
Adds temporal context, emphasizing that the situation occurred in the past.
at one time there were
Highlights a specific period when something existed. Adds a sense of a former era.
there have been times
Emphasizes multiple instances or occasions in the past, shifting focus to recurring events.
there were formerly
Formally indicates a past state that has changed, fitting for formal contexts.
previously there were
Similar to "formerly", this highlights that past conditions have changed.
earlier there were
Indicates that the situation existed before a certain point in time.
back then there were
Informally refers to a past period, suitable for casual conversation.
FAQs
Is "there are once" grammatically correct?
No, "there are once" is not grammatically correct. The correct phrasing would be "there was once" for singular instances or "there used to be" to refer to something that existed in the past.
When should I use "there was once" instead of "there are once"?
Use "there was once" when you are referring to a single event or item in the past. The phrase "there are once" incorrectly mixes plural and singular forms.
What are some alternatives to "there are once" to indicate something existed in the past?
Alternatives include "there used to be", "once there was", or simply rephrasing the sentence to use past tense verbs.
How can I avoid making mistakes when using phrases to describe past events?
Pay close attention to subject-verb agreement. Ensure that singular subjects are paired with singular verbs (e.g., "there was"), and plural subjects with plural verbs (e.g., "there are"). Using "there used to be" can also help avoid these issues.
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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
88%
Authority and reliability
1.8/5
Expert rating
Real-world application tested