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
ascertain of
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase 'ascertain of' is not correct or usable in written English.
You can use the word 'ascertain' alone, or use a phrase like 'ascertain from/whether/how/why' instead. For example: I asked the manager to ascertain whether the report was correct.
⚠ May contain grammatical issues
Science
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
2 human-written examples
I believe a politician's personality, though difficult to ascertain of course, is a more accurate map to their tenure.
News & Media
This was primarily attributed to a lack of information provided with respect to methods of patient recruitment (selection bias) and criteria used to ascertain of a subsequent fall (reference standard).
Science
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
During the study period, 510 women were ascertained of whom 453 (89%) were eligible.
Science
Demographic and professional determinants ascertained of past-month adverse drug reaction (ADR) suspicion and past-year ADR reporting.
Science
With a larger number of clinics and subjects, ascertaining of differential effects of variance due to rater and/or clinic could be assessed.
We surveyed adult patients pre-HCT to ascertain completion of various elements of ACP.
Academia
Background data will be analysed following completion of recruitment to ascertain homogeneity of the three groups.
Science
Worldwide figures are difficult to ascertain because of the wide variety of outlets available for betting.
News & Media
They were eventually able to ascertain cause of death for 98% of deceased survey respondents.
News & Media
The proper mode of ascertaining 'processings of sugar * * * to which proportionate shares * * * pertained' is not here in controversy.
Academia
An extensive review of literature was conducted to ascertain traits of Generation Y students.
Expert writing Tips
Best practice
Avoid using "ascertain of". Use "ascertain" followed by the object of your inquiry, or use "ascertain whether/how/why" to introduce a clause. For example, "ascertain the facts" or "ascertain whether the data is accurate."
Common error
The phrase "ascertain of" is often used incorrectly due to a misunderstanding of the verb's transitivity. Remember that "ascertain" directly takes an object; don't add "of" after it.
Source & Trust
81%
Authority and reliability
1.8/5
Expert rating
Real-world application tested
Linguistic Context
The expression "ascertain of" functions as a verb followed by a preposition, but it is grammatically incorrect. The verb "ascertain" requires a direct object and should not be followed by "of". As Ludwig AI states, the expression is not correct in written English.
Frequent in
Science
33%
News & Media
33%
Academia
33%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, while you may encounter the phrase "ascertain of" in various sources, it's essential to recognize that it is grammatically incorrect. The correct usage involves using "ascertain" directly followed by its object, without the preposition "of". As Ludwig AI indicates, this phrase is not considered proper English. Instead, opt for alternatives like "determine", "establish", or "verify", or restructure your sentence to use "ascertain" correctly. The examples found are from a mix of scientific, news, and academic contexts, indicating that this error can occur across different registers, despite its incorrectness.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
determine
This is a more direct and grammatically correct alternative to "ascertain of".
establish
Focuses on firmly setting or proving something, similar to confirming information.
verify
Highlights the act of confirming the truth or accuracy of something.
confirm
Emphasizes validating or reinforcing the correctness of information.
find out
Offers a more informal way to express the discovery of information.
discover
Stresses the act of uncovering something previously unknown.
ascertain whether
Specifies a condition or possibility to be determined.
ascertain how
Focuses on the method or process of finding something out.
ascertain the cause of
Specifies the object of ascertainment, like a cause or reason.
ascertain the extent of
Specifies the object of ascertainment, like the degree or scope.
FAQs
How can I use "ascertain" correctly in a sentence?
Use "ascertain" directly followed by the information you are trying to discover. For example, "The detective needed to ascertain the truth." You can also use it with "whether", "how", or "why": "The scientist tried to "ascertain whether" the experiment was successful".
What are some alternatives to the phrase "ascertain of"?
Is it correct to say "ascertain of" something?
No, it is not correct. The verb "ascertain" is transitive and should be followed directly by its object. "Ascertain" means to find something out for certain, so the "of" is unnecessary and grammatically incorrect.
What's the difference between "ascertain" and "find out"?
"Ascertain" is a more formal and precise term than "find out". While both mean to discover something, "ascertain" suggests a more careful and systematic investigation. In most everyday contexts, "find out" is perfectly acceptable, but in formal or professional writing, "ascertain" may be more appropriate.
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
81%
Authority and reliability
1.8/5
Expert rating
Real-world application tested