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
assert that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "assert that" is correct and usable in written English.
You can use it when you want to make a strong statement or emphasize a point. For example: "I assert that the candidate is the most qualified for the job."
✓ Grammatically correct
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
60 human-written examples
"Did he at any time assert that immunity?" he asked.
News & Media
We assert that is bounded.
We assert that is strictly contractive on.
where We assert that belongs to.
Now, we assert that is bounded.
To assert that ancestors are hypothetical is to assert that evolutionary descent itself is hypothetical.
We assert that { x n } is a Cauchy sequence.
Hence, from our previous considerations, we can assert that (2.15).
We assert that is a generalized complete metric space.
The plaintiffs assert that the A.C.A.
News & Media
The Burmese assert that it devours fire.
Academia
Expert writing Tips
Best practice
Use "assert that" when you want to express a confident and firm statement, particularly when presenting an argument or a belief as true.
Common error
While "assert that" is a perfectly valid phrase, avoid using it excessively in casual conversation or informal writing. Simpler alternatives like "say that" or "believe that" can sound more natural.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "assert that" functions as a declarative verb phrase. It introduces a statement presented as a fact or belief. Ludwig AI indicates this is a grammatically correct phrase.
Frequent in
Science
43%
News & Media
34%
Academia
23%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "assert that" is a versatile and grammatically sound construction used to confidently declare a statement, belief, or argument. As Ludwig AI indicates, this phrase is very common and appears frequently in scientific, news, and academic sources. While appropriate for various contexts, it's best to consider the formality of the situation and choose simpler alternatives like "say that" or "believe that" for more informal settings. Consider exploring options like "maintain that", "contend that" or "argue that" for nuanced meaning.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
affirm that
This suggests a more formal and confident declaration.
maintain that
This suggests a continued assertion, often in the face of opposition.
argue that
Suggests a reasoned presentation of a point of view.
declare that
This implies a formal or official announcement.
submit that
This is often used in legal or formal arguments to introduce a point.
contend that
This implies arguing a point of view, often in a debate.
aver that
This is a somewhat formal way of stating something is true.
allege that
This indicates an assertion without proof, often in legal contexts.
posit that
This suggests putting forward an idea or theory for consideration.
profess that
This can imply a belief or feeling that may or may not be genuine.
FAQs
What does "assert that" mean?
"Assert that" means to state something confidently and forcefully as if it is true, often when presenting an argument or belief.
How to use "assert that" in a sentence?
You can use "assert that" to introduce a statement you believe to be true, such as: "I "assert that" the data supports my hypothesis."
What can I say instead of "assert that"?
You can use alternatives like "maintain that", "contend that", or "argue that" depending on the context.
Is it better to "assert that" or "claim that"?
"Assert that" implies a strong belief in the truth of a statement, while "claim that" can suggest the statement is questionable or unproven. The best choice depends on the context and your confidence in the statement's validity.
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
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested