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
caution must be made when
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "caution must be made when" is not correct in English.
The correct expression would be "caution must be exercised when." You can use it when advising someone to be careful or to take care in a specific situation. Example: "Caution must be exercised when handling hazardous materials to ensure safety."
⚠ May contain grammatical issues
Science
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
3 human-written examples
Extra caution must be made when designing such experiments.
Science
33 Even though our study on proANP measurement showed equal prognostic properties, caution must be made when making direct comparisons.
Science
However, although obesity is associated with an increased risk of developing insulin resistance and type 2 diabetes [ 47] caution must be made when assessing the relationship with cancer.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
Caution must be made for lesions ≤2 cm [1].
Science
The apparatus meets the design criteria with staged air but caution must be made to avoid over-staging.
Science
Caution must also be made when combining brentuximab vedotin with other chemotherapies leading to increased pulmonary toxicity, including bleomycin.
Overall, caution should be made when interpreting the findings.
Science
Thus, cautions should be made when interpreting results.
Science
Critics of strict mandatory sentencing caution that allowances must be made for unwitting violations.
News & Media
From a conservation perspective, conclusions that outlier plots sample significant vegetation must be made with caution.
Science
However, comparisons must be made with caution due to methodological variations between studies and gaps in the literature.
Expert writing Tips
Best practice
When writing, replace the phrase "caution must be made when" with "caution must be exercised when" or "caution must be used when" to ensure grammatical correctness and clarity.
Common error
Avoid using "make" in the context of caution or care. The correct phrasing is "exercise caution" or "use caution". "Make" implies creation, which doesn't fit the intended meaning of careful consideration.
Source & Trust
75%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "caution must be made when" is intended to express the necessity of being careful or prudent in a particular situation. However, according to Ludwig AI, it's grammatically incorrect. The intended function is to advise or warn about potential risks.
Frequent in
Science
100%
Less common in
News & Media
0%
Formal & Business
0%
Ludwig's WRAP-UP
In summary, while the intention behind the phrase "caution must be made when" is clear—to advise carefulness—it's considered grammatically incorrect. Ludwig AI suggests using "caution must be exercised when" or "caution must be used when" instead. These alternatives maintain the original meaning while ensuring grammatical accuracy. The contexts in which similar phrases appear are largely scientific, underlining the importance of precise language. Always prioritize grammatically correct phrasing for clear and effective communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
caution must be exercised when
Replaces "made" with "exercised", resulting in grammatically correct and more formal phrasing.
caution must be used when
Substitutes "made" with "used", providing grammatically correct and slightly less formal alternative.
care should be taken when
Replaces "caution must be made" with "care should be taken", softening the tone while maintaining the meaning.
one must be cautious when
Changes the structure to emphasize personal responsibility for being careful.
prudence is required when
Substitutes "caution" with "prudence", offering a more formal and emphatic expression.
discretion is advised when
Replaces "caution" with "discretion", suggesting the need for tact and good judgment.
vigilance is necessary when
Substitutes "caution" with "vigilance", highlighting the need for alertness and watchfulness.
attention must be paid when
Shifts focus to the act of paying attention, rather than exercising caution directly.
steps must be taken carefully when
Emphasizes the need for careful action and specific steps.
extreme caution is needed when
Adds emphasis by specifying "extreme caution", suggesting a higher level of risk.
FAQs
What is the correct way to express the need for caution?
The correct phrases are "caution must be exercised when" or "caution must be used when".
Is "caution must be made when" grammatically correct?
No, the phrase "caution must be made when" is grammatically incorrect. The accurate expressions are "caution must be exercised when" or "caution must be used when".
What are some alternatives to "caution must be made when"?
Alternatives include "care should be taken when", "one must be cautious when", or "prudence is required when".
How do I use "caution must be exercised when" in a sentence?
Example: "Caution must be exercised when handling hazardous materials to prevent accidents."
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
75%
Authority and reliability
2.8/5
Expert rating
Real-world application tested