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
this is proof that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "this is proof that" is correct and usable in written English.
You can use it when referring to something that provides evidence or confirmation of something else. For example: "This is proof that studying diligently can lead to success."
✓ Grammatically correct
News & Media
Science
Formal & Business
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
58 human-written examples
But to others, this is proof that they didn't.
News & Media
To them, this is proof that the organization is nefarious.
News & Media
"This is proof that we are deep inside the kitchen".
News & Media
"This is proof that the guy rocks out," he said.
News & Media
"This is proof that civilians are caught up in these attacks".
News & Media
"This is proof that there were rock fans watching Eurovision," said the group's singer, Mr Lordi.
News & Media
Jones argues this is proof that users really do want that curated environment.
News & Media
"This is proof that the FARC is falling apart," Mr. Santos said.
News & Media
All this is proof that women have managed to rise within the ranks of the fundamentalists.
News & Media
"This is proof that when such a big country industrializes, its effect will spread everywhere".
News & Media
"The plane's wreckage was found over a two-kilometer area, and this is proof that there was no explosion".
News & Media
Expert writing Tips
Best practice
When using "this is proof that", avoid overstating the certainty of your conclusion. While the evidence may be compelling, acknowledge potential limitations or alternative interpretations to maintain credibility.
Common error
Avoid using personal experiences or isolated incidents prefaced with "this is proof that" to make broad generalizations. Ensure your evidence is representative and statistically significant to avoid misrepresenting the situation.
Source & Trust
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "this is proof that" functions as a demonstrative phrase, introducing evidence or reasoning to support a claim. Ludwig AI confirms its grammatical correctness and usability. It serves to strongly assert a connection between presented information and a conclusion, as seen in Ludwig's examples across various contexts.
Frequent in
News & Media
66%
Science
19%
Formal & Business
6%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "this is proof that" is a versatile phrase used to introduce evidence and support a claim. As confirmed by Ludwig AI, it is grammatically sound and widely used. It is most frequently found in News & Media sources, and serves to persuade and convince the audience. When using this phrase, ensure the evidence is relevant and strong to build a credible argument.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
this is evidence that
Replace "proof" with "evidence", meaning something that furnishes proof.
this demonstrates that
Replaces "proof" with "demonstrates", focusing on the act of showing or illustrating something.
this confirms that
Emphasizes the act of verifying or establishing the truth of something.
this indicates that
Replaces "proof" with "indicates", focusing on suggesting or pointing to something.
this validates that
Highlights the act of confirming the accuracy or correctness of something.
this substantiates that
Focuses on providing evidence to support or establish a claim.
this establishes that
Emphasizes the act of setting up or demonstrating something definitively.
this bears witness to
This alternative is more formal, and expresses how something gives or acts as testimony to the truth.
it follows that
Suggests a logical consequence or conclusion based on prior information.
this suggests that
This provides an indirect indication or hint of something.
FAQs
How can I use "this is proof that" in a sentence?
Use "this is proof that" to introduce evidence supporting your argument. For example, "The increase in sales after the marketing campaign is proof that it was successful".
What are some alternatives to "this is proof that"?
You can use alternatives like "this demonstrates that", "this confirms that", or "this validates that" depending on the nuance you want to convey.
When is it inappropriate to use "this is proof that"?
Avoid using "this is proof that" when the evidence is weak, anecdotal, or doesn't directly support the claim you're making. Overusing it can weaken your argument.
Is "this is proof that" formal or informal language?
"This is proof that" is generally considered neutral and appropriate for both formal and informal contexts. However, in highly academic or scientific writing, consider stronger alternatives like "this establishes that".
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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
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested