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 that
Grammar usage guide and real-world examplesUSAGE SUMMARY
'that that' is correct and can be used in written English.
It is used to refer back to a previous statement. For example: I believe that the book is an interesting read. That that, I can't seem to stop thinking about it.
✓ Grammatically correct
News & Media
Academia
Science
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
"That — that was special".
News & Media
That - that was the time.
Academia
I like that, that edge".
News & Media
This means that ; that is,.
This shows that ; that is,.
Because that, that-.
News & Media
Not that that mattered.
News & Media
Not that that helped.
News & Media
Except that that doesn't happen.
News & Media
Not that that needs repeating.
News & Media
That that be too pessimistic.
News & Media
Expert writing Tips
Best practice
When using "that that", ensure the repetition serves a purpose, such as emphasizing a particular point or clarifying which 'that' you are referring to. Avoid using it unnecessarily, as it can sometimes sound awkward.
Common error
Avoid using "that that" simply as filler. If the sentence works just as well without the repetition, remove one of the "that" instances to maintain clarity and conciseness.
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The primary grammatical function of "that that" is to act as a demonstrative pronoun followed by a subordinating conjunction. It's used to refer back to a previous clause or idea, with the second "that" introducing a clause that further explains or emphasizes the first. According to Ludwig, it is correct, yet may sound repetitive if overused.
Frequent in
News & Media
50%
Academia
33%
Science
17%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "that that" is a grammatically valid phrase used for emphasis or clarification by referring back to a previously stated "that". While Ludwig confirms its correctness, the tool also highlights that overusing it can lead to redundancy. It's most commonly found in News & Media, Academia and Science domains. Remember to use it sparingly to ensure clarity and avoid sounding repetitive, opting for alternatives like "the fact that" when appropriate. To make certain about usage, it’s crucial to consider the specific context.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
the fact that
Replaces the repetition with a more formal and concise phrasing.
that particular
Adds specificity to the "that" being referenced, reducing redundancy.
that specific
Similar to "that particular" but emphasizes the distinct nature of the item.
the aforementioned
Formally refers back to something previously mentioned.
the one that
Offers a more conversational way to specify which "that" is meant.
this very
Emphasizes the importance or immediacy of the "that" being discussed.
the point that
Shifts focus to the idea or argument being made.
the concept that
Similar to "the point that" but emphasizes the abstract nature.
what was stated
Rephrases to directly refer to a previous statement.
as indicated earlier
Formally points back to a prior reference.
FAQs
How can I use "that that" in a sentence?
Use "that that" when you need to refer back to a previously mentioned "that", especially when clarity is needed. For example: "I believe that the book is an interesting read. That that, I can't seem to stop thinking about it."
What can I say instead of "that that" to avoid repetition?
You can use alternatives like "the fact that", "that particular", or "the aforementioned" depending on the context.
Is it grammatically correct to use "that that" in a sentence?
Yes, it is grammatically correct but should be used sparingly. The phrase "that that" is used to refer back to a previous statement, adding emphasis or clarification.
When is it appropriate to use "that that" in writing?
It is appropriate to use "that that" when the sentence structure requires a clarification of which "that" you are referring to, or when you want to emphasize a previously mentioned "that". However, ensure its usage adds value and doesn't sound repetitive.
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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
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested