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
be warned that
Grammar usage guide and real-world examplesUSAGE SUMMARY
'be warned that' is correct and usable in written English.
It is often used to give someone a warning or caution about a potential consequence of their actions. For example, "Be warned that if you break the rules, there will be serious penalties."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(20)
you should know that
be aware that
heads up
bear in mind that
take heed that
it should be noted that
let it be known that
mind you
mark my words
be proclaimed that
be informed that
be emphasised that
be explained that
be suggested that
be revealed that
be recognized that
be alerted that
be apprised that
be realized that
be investigated that
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
Be warned that the images are extremely bloody.
News & Media
(Be warned that this one is difficult to watch).
News & Media
Parents should be warned that the subject matter is harsh.
News & Media
Be warned that accommodation gets booked up weeks in advance.
News & Media
Be warned that this is an aggressive spreader.
News & Media
Be warned that this is not the easiest bedtime material.
News & Media
Patrons should be warned that it is a long evening, nearly five hours in all.
News & Media
If you're looking for luxury, be warned that the en-suite showers aren't very powerful.
News & Media
Be warned that the initial Time Machine backup can require a very long time.
News & Media
Be warned that the highway gets congested, even outside rush hour.
News & Media
Be warned that the other floors are not as viewer-friendly.
News & Media
Expert writing Tips
Best practice
When using "be warned that", ensure the consequence or potential issue is clearly stated to provide context for the warning.
Common error
Avoid using "be warned that" without specifying what the warning pertains to. A vague warning can confuse or alarm the reader without providing useful information. Instead, be specific about the potential consequences.
Source & Trust
79%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "be warned that" primarily functions as an imperative construction, serving to introduce a cautionary statement or warning. As noted by Ludwig AI, this construction is generally correct and usable. Examples from Ludwig show it often precedes explanations of potential dangers or negative outcomes.
Frequent in
News & Media
35%
Wiki
33%
Science
32%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "be warned that" is a versatile phrase used to introduce cautionary information across various contexts. As confirmed by Ludwig AI, it functions as an imperative to alert readers or listeners to potential risks or negative consequences. It is commonly used in news, media, scientific writing and wikis. While its tone is generally neutral, it can lean towards formal depending on the context. When using "be warned that", be sure to clearly state the potential issue you are warning against, avoiding vagueness. Consider alternatives such as ""be aware that"" or ""you should know that"" for slightly less formal situations.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
be aware that
Similar in meaning, but slightly less forceful in its warning.
you should know that
Directly informs someone of something important or cautionary.
bear in mind that
Advises the listener or reader to remember or consider something.
take heed that
More formal and emphatic, urging careful attention to what follows.
it should be noted that
Emphasizes the importance of the information being presented.
let it be known that
A more formal and authoritative way of issuing a warning or announcement.
mind you
Used to introduce a qualification or cautionary remark.
heads up
An informal way to give a warning.
forewarned is forearmed
An idiomatic expression advising that knowing something in advance prepares you for it.
mark my words
Used to emphasize a warning or prediction, suggesting the speaker is confident in their statement.
FAQs
How can I use "be warned that" in a sentence?
"Be warned that" is typically followed by a clause explaining the potential danger or negative consequence. For example, "Be warned that the road ahead is icy" or "Be warned that unauthorized access is prohibited".
What's a less formal alternative to "be warned that"?
For less formal situations, you could use alternatives like "you should know that" or "be aware that". The phrase "heads up" is also a very informal option.
Is it correct to say "being warned that" instead of "be warned that"?
While "being warned that" is grammatically correct, it changes the emphasis. "Be warned that" is a direct imperative, giving a warning. "Being warned that" describes the state of receiving a warning. The former is much more common and direct in most contexts.
When is it appropriate to use "be warned that"?
"Be warned that" is appropriate when you need to alert someone to a potential danger, risk, or negative outcome. It's a useful phrase in situations where clarity and directness are important, like in instructions, safety notices, or cautionary advice.
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
79%
Authority and reliability
4.5/5
Expert rating
Real-world application tested