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Discover LudwigThe phrase "why that is" is correct and usable in written English
You can use it to introduce an explanation of a previous statement. For example: "The sky is red today, why that is I'm not sure."
Exact(59)
"Exactly why that is we don't know," he said.
Exactly why that is so remains obscure.
And we all know why that is.
I don't know why that is".
Can you tell us why that is?
— And I wonder why that is.
Now I wonder why that is.
"I can't explain why that is.
No idea why that is.
"I wonder why that is," Maxtone-Graham said.
Similar(1)
Wonder why that is.
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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