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 sure of that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "be sure of that" is correct and usable in written English.
You can use it to emphasize certainty or assurance about a statement or fact. Example: "If you think you can finish the project on time, be sure of that before making any promises."
✓ Grammatically correct
News & Media
Alternative expressions(7)
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
51 human-written examples
"It will hurt us, be sure of that.
News & Media
There will be dramas, be sure of that.
News & Media
'Ah, one can never be sure of that.
News & Media
Customers will be furious, we can be sure of that.
News & Media
| Pregame Well, this will be interesting, you can be sure of that.
News & Media
They may be too high, but there is no way to be sure of that.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
7 human-written examples
He is sure of that.
News & Media
I'm sure of that.
News & Media
They are sure of that.
News & Media
Not restaurants, he's sure of that.
News & Media
I was the star, I was sure of that.
News & Media
Expert writing Tips
Best practice
When using "be sure of that", consider the context and audience. While generally appropriate, it can sound slightly informal. For a more formal tone, consider "rest assured".
Common error
Avoid using "be sure of that" repeatedly in close proximity within your writing. Overuse can make your writing sound repetitive and less impactful. Vary your language by using synonyms like "without a doubt" or "you can count on it".
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "be sure of that" functions primarily as an emphatic assertion. Ludwig confirms its usability, and it's used to reassure or convince someone of the truth or certainty of a statement.
Frequent in
News & Media
94%
Formal & Business
3%
Science
3%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "be sure of that" is a common and grammatically correct phrase used to express certainty and provide assurance. As noted by Ludwig AI, it is usable in written English to emphasize a fact or statement. Its primary function is to reinforce the speaker's confidence and reassure the listener. While generally appropriate for various contexts, it can be replaced with alternatives like "rest assured" or "you can count on it" depending on the desired level of formality.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
you can bet on that
Replaces "be sure" with "can bet", emphasizing confidence in the outcome.
you can count on it
Substitutes "be sure" with "can count", focusing on the reliability of something.
without a doubt
Directly asserts the absence of uncertainty about something.
rest assured
Offers a formal way to convey certainty and remove doubt.
it's a given
Presents something as a certainty, something that is already known or accepted.
guaranteed
Short and sweet variant of QUERY, this alternative expresses a high level of confidence
take it to the bank
Uses an idiom to express absolute certainty, suggesting the outcome is guaranteed.
you can take that to the bank
Uses a longer idiom to express absolute certainty, suggesting the outcome is guaranteed.
mark my words
Emphasizes the speaker's conviction, urging the listener to remember their statement.
take my word for it
Asks the listener to trust the speaker's assertion without needing further proof.
FAQs
How can I use "be sure of that" in a sentence?
You can use "be sure of that" to emphasize certainty or assurance about a statement or fact. For example, "If you follow these instructions carefully, "be sure of that", the project will succeed."
What can I say instead of "be sure of that"?
You can use alternatives like "rest assured", "you can count on it", or "without a doubt" depending on the context.
Is it appropriate to use "be sure of that" in formal writing?
While "be sure of that" is generally acceptable, it can sound slightly informal. For formal writing, consider using more formal alternatives like "rest assured" or stating the fact directly without the added assurance.
What's the difference between "be sure of that" and "be certain of that"?
"Be certain of that" is a more formal version of "be sure of that". Both phrases express confidence, but "be certain" carries a slightly more authoritative tone.
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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
4.5/5
Expert rating
Real-world application tested