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
was guaranteed by
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "was guaranteed by" is correct and usable in written English.
It can be used in contexts where you want to indicate that something was assured or promised by a specific entity or individual. Example: "The success of the project was guaranteed by the extensive research conducted beforehand."
✓ Grammatically correct
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified similar examples from authoritative sources
Similar Expressions
60 human-written examples
Police station advice was guaranteed by law.
News & Media
He was also the god of justice, which was guaranteed by the king.
Encyclopedias
After all, it was guaranteed by the government of Ireland, rated AAA at the time.
News & Media
Still, because it was guaranteed by the government, Roosevelt feared that it could bankrupt the Treasury.
News & Media
About one-third of that sum was guaranteed by the IMF.
Encyclopedias
The freedom to organize political parties was guaranteed by the 1947 constitution.
Encyclopedias
The security of the merchandise was guaranteed by the administration officials.
Wiki
The normality of the chemical-protein interactive effect was guaranteed by the Kolmogorov-Smirnov test.
Science
Calibration was guaranteed by the supplying company.
Science
The data quality was guaranteed by stringent monitoring.
Science
Reproducibility was guaranteed by obtaining 10 measurements per experimental sample.
Expert writing Tips
Best practice
When using "was guaranteed by", clearly specify the entity or individual providing the guarantee to ensure clarity and avoid ambiguity.
Common error
Avoid using "was guaranteed by" when the assurance is based on assumptions or probabilities rather than a concrete commitment.
Source & Trust
60%
Authority and reliability
3.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "was guaranteed by" functions as a passive voice construction, indicating that an assurance or promise was provided by a specific entity. It highlights the source of the guarantee rather than the subject being guaranteed. Given the lack of examples, Ludwig can only confirm the phrase's basic validity.
Frequent in
Science
0%
News & Media
0%
Formal & Business
0%
Less common in
Science
0%
News & Media
0%
Formal & Business
0%
Ludwig's WRAP-UP
In summary, the phrase "was guaranteed by" is a grammatically correct passive voice construction used to indicate that an assurance or promise was provided by a specific entity in the past. Although Ludwig AI indicates the phrase is correct, there are no exact examples in the provided data, so its usage and frequency are difficult to determine. Related phrases include "was assured by", "was ensured by", and "was secured by", offering alternative ways to express a similar meaning. When using this phrase, specify the source of the guarantee clearly and avoid overstating the assurance.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
was assured by
Focuses on the assurance provided, rather than a strict guarantee.
was ensured by
Emphasizes the action taken to make something certain.
was secured by
Highlights the act of securing or protecting something.
was underwritten by
Suggests a financial backing or support.
was backed by
Implies support or endorsement from a source.
was certified by
Highlights the official confirmation or validation.
was warranted by
Suggests a formal promise or assurance of quality.
was validated by
Emphasizes the confirmation of accuracy or truth.
was confirmed by
Indicates the verification or establishment of something.
was vouched for by
Suggests personal assurance or support.
FAQs
How can I use "was guaranteed by" in a sentence?
Use "was guaranteed by" to indicate that something was assured or promised by a specific entity. For example: "The loan repayment was guaranteed by the bank."
What can I say instead of "was guaranteed by"?
You can use alternatives like "was assured by", "was ensured by", or "was secured by" depending on the context.
Is it correct to say "is guaranteed by" instead of "was guaranteed by"?
Yes, "is guaranteed by" is correct, but it implies that the guarantee is currently in effect. "Was guaranteed by" indicates that the guarantee was in effect at a past time.
What's the difference between "was guaranteed by" and "was protected by"?
"Was guaranteed by" indicates a promise or assurance, while "was protected by" suggests a safeguard or defense. The former implies a commitment, while the latter suggests a form of security.
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
60%
Authority and reliability
3.9/5
Expert rating
Real-world application tested