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
that didn't
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that didn't" is correct and usable in written English.
It can be used to refer to something that did not occur or was not successful in a previous context. Example: "I thought the plan would work, but that didn't happen."
✓ Grammatically correct
News & Media
Alternative expressions(4)
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
"Fortunately, that didn't happen".
News & Media
Obviously, that didn't materialize.
News & Media
So that didn't quite count.
News & Media
Entrances that didn't seem visible".
News & Media
Competitors that didn't failed.
News & Media
And those that didn't.
News & Media
That didn't".
News & Media
That didn't stop her.
News & Media
But that didn't work.
News & Media
But that didn't last.
News & Media
That didn't fly.
News & Media
Expert writing Tips
Best practice
Use "that didn't" to clearly and concisely indicate that a particular action or event did not occur or was unsuccessful. It is suitable for both formal and informal writing.
Common error
Avoid using "that didn't" when the subject requires a different auxiliary verb. For instance, don't use it with plural subjects that require "didn't" to be replaced by something else.
Source & Trust
91%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that didn't" functions as a negative indicator, expressing the non-occurrence or failure of an action or event. As Ludwig AI suggests, it's a grammatically sound and common way to negate a statement. The examples provided showcase its broad applicability across different contexts.
Frequent in
News & Media
100%
Less common in
Science
0%
Formal & Business
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, "that didn't" is a grammatically correct and widely used phrase to express the non-occurrence or failure of an action or event. Ludwig AI confirms its appropriateness and the examples showcase its diverse applications, particularly in news and media. While more formal alternatives exist, its neutral register allows for versatile usage. Remember to consider the context and choose the most fitting expression, keeping in mind the potential for more descriptive or formal options like "that did not" or "that failed to".
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that did not
A more formal and explicit way of saying "that didn't".
that didn't work out
Specifically refers to something not resulting in a positive outcome or resolution.
that failed to
Emphasizes the failure of something to achieve a desired outcome.
that wasn't effective
Focuses on the ineffectiveness of something.
that proved unsuccessful
Highlights the lack of success in a more descriptive manner.
that had no effect
Stresses the absence of any impact or result.
that was not the case
States that something was not true or did not happen as expected.
it didn't happen
A direct statement indicating the non-occurrence of an event.
that wasn't so
Indicates that a previous statement or assumption was incorrect.
that wasn't the reality
Emphasizes that the actual situation differed from what was expected.
FAQs
How can I rephrase "that didn't" to sound more formal?
For a more formal tone, you can use phrases like "that did not", "that failed to", or "that proved unsuccessful" depending on the context.
Is it grammatically correct to use "that didn't" in academic writing?
Yes, "that didn't" is grammatically correct. However, in academic writing, it might be preferable to use a more formal alternative such as "that did not" or "that was not the case" to maintain a professional tone.
What's the difference between "that didn't work" and "that didn't work out"?
"That didn't work" generally means something was ineffective. "That didn't work out" implies a plan or situation did not resolve as hoped, often suggesting a more involved or long-term process.
Can I use "that didn't" in negative sentences?
Yes, "that didn't" is inherently negative. It is used to indicate that something did not occur or was not true. For example, "That didn't matter" means the thing in question had no importance.
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
91%
Authority and reliability
4.6/5
Expert rating
Real-world application tested