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
why that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "why that" is correct and usable in written English. You can use it when asking for clarification or reasoning behind a specific choice or statement. Example: "I don't understand why that decision was made." Alternative expressions include "what's the reason for that" and "why is that."
✓ Grammatically correct
News & Media
Wiki
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
Why that car?
News & Media
Why that show?
News & Media
(Why that number?
News & Media
Why that date?
News & Media
Why that name?
News & Media
I wonder why that is.
News & Media
"Why that word?
News & Media
Why that career?
News & Media
And why that string?
News & Media
Why that day?
News & Media
Wonder why that is.
News & Media
Expert writing Tips
Best practice
Use "why that" to seek clarification on a specific statement or action. It directly prompts for the underlying reason or cause. For example, "The company chose to invest in renewable energy. Why that?"
Common error
Avoid using "why that" when a broader explanation is needed. It's best suited for direct follow-up questions about a specific point, not for initiating general inquiries. For example, instead of "Why that?" when asking about climate change, ask "What are the causes of climate change?"
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "why that" functions primarily as an interrogative expression, used to seek clarification or justification for a preceding statement, action, or choice. As Ludwig AI confirms, it is grammatically sound and common in use. The examples highlight its role in prompting for reasons or explanations.
Frequent in
News & Media
60%
Wiki
20%
Formal & Business
10%
Less common in
Science
5%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, "why that" is a common and grammatically sound interrogative phrase used to seek immediate clarification or justification for something previously mentioned. Ludwig AI affirms its correctness and frequent usage across various sources, including News & Media and Wiki. While it's more informal than "why is that?", it remains a clear and efficient way to prompt for explanations. To ensure effective communication, use "why that" to address specific points and avoid employing it when a more comprehensive inquiry is required.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
why is it so
Replaces "that" with "it so" focusing on the reason something is a certain way.
what's the reason for that
Replaces "why" with "what's the reason" and adds a prepositional phrase.
what makes you say that
Focuses on the statement made and asks for its basis.
what's the explanation for that
Substitutes "why" with "what's the explanation" emphasizing a detailed account.
can you elaborate on that
Shifts the focus to requesting more details about a specific point.
what's the rationale behind that
Replaces "why" with "what's the rationale", suggesting a need for understanding the logical basis.
could you clarify that
Asks for a clearer understanding of something previously mentioned.
what's so special about that
Implies skepticism and asks what makes something particularly noteworthy.
what's the point of that
Questions the usefulness or purpose of something.
how come
A more informal way of asking why something is the case.
FAQs
How can I use "why that" in a sentence?
You can use "why that" to directly ask for the reason behind a specific statement or action. For example, "The team decided to change its strategy. "Why that"?"
What are some alternatives to the phrase "why that"?
Alternatives include "what's the reason for that", "what makes you say that", or "how come depending on the context".
Is it correct to say "the reason is why that"?
While understandable, "the reason is why that" can sound redundant. It's generally better to rephrase it as "the reason is because..." or simply state the reason directly.
What's the difference between "why that" and "why is that"?
"Why that" is a more concise and direct way of asking for clarification, often used in informal settings. "Why is that" is slightly more formal and provides a fuller grammatical structure.
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested