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 sure about
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "was sure about" is correct and usable in written English.
You can use it when expressing confidence or certainty regarding a particular subject or situation. Example: "She was sure about her decision to move to a new city for a job opportunity."
✓ Grammatically correct
News & Media
Academia
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
50 human-written examples
"The Barcelona results have shown it was the right decision," he said, "something I was sure about right from the beginning".
News & Media
Nobody was sure about Fleury.
News & Media
But he was sure about one thing.
News & Media
"Jessie was sure about certain things," Ms. Siler said.
News & Media
"But Bud was sure about one thing," Levin said.
News & Media
"It was never really something I was sure about until I understood Rudy Guede".
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
10 human-written examples
He is sure about that.
News & Media
I'm sure about that.
News & Media
We're sure about it.
Academia
One cannot be sure about Brecht.
News & Media
But this we can be sure about.
News & Media
Expert writing Tips
Best practice
Ensure that the context provides sufficient information about what the subject "was sure about". Clarity is key to effective communication.
Common error
Avoid using "was sure about" without clearly stating what the certainty pertains to. Vague references can confuse the reader. Always ensure the object of certainty is explicit. For instance, instead of saying "He was sure about it", specify "He was sure about his decision to resign".
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "was sure about" functions as a linking verb phrase followed by a preposition, expressing a state of certainty or conviction in the past. As shown by Ludwig, it is used to indicate confidence regarding a particular subject or situation.
Frequent in
News & Media
64%
Academia
15%
Formal & Business
9%
Less common in
Science
6%
Reference
3%
Encyclopedias
3%
Ludwig's WRAP-UP
In summary, the phrase "was sure about" effectively conveys past certainty or confidence. As Ludwig AI verifies, the phrase is grammatically sound and highly versatile. It appears most frequently in news and media, alongside academic and formal business contexts. For expressing similar ideas, consider alternatives like "was certain of" or "had no doubt about". When using "was sure about", ensure clarity by explicitly stating what the certainty pertains to. The linguistic analysis confirms its function as a verb phrase expressing a past state of conviction, suitable for a neutral register.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
was certain of
Replaces "sure" with "certain", indicating a strong belief.
was convinced of
Emphasizes the persuasive aspect of the certainty.
had no doubt about
Highlights the absence of uncertainty.
felt confident about
Focuses on the feeling of assurance.
was positive about
Indicates an optimistic certainty.
was assured of
Implies a guarantee or reassurance.
believed firmly in
Highlights a strong belief in something.
was definite about
Emphasizes the lack of ambiguity in the certainty.
had complete faith in
Suggests a trust-based certainty.
knew without a doubt
Emphasizes that the knowledge is certain and unquestionable.
FAQs
How can I use "was sure about" in a sentence?
You can use "was sure about" to express a past feeling of certainty or confidence regarding something. For example: "She was sure about her answer during the exam" or "He was sure about the path he wanted to take in life".
What can I say instead of "was sure about"?
You can use alternatives like "was certain of", "was convinced of", or "had no doubt about" depending on the specific context and nuance you want to convey.
Is it better to say "was sure about" or "was certain about"?
Both "was sure about" and "was certain about" are grammatically correct and convey a strong belief. The choice between them often depends on personal preference or the desired tone. "Certain" might suggest a slightly stronger degree of conviction.
What's the difference between "was sure about" and "felt confident about"?
"Was sure about" implies a firm conviction based on evidence or reasoning, while "felt confident about" suggests a feeling of self-assurance or belief in one's abilities. The former is more about the certainty of something being true, the latter about one's capability.
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
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested