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Discover LudwigThe phrase "is that when" is grammatically correct and can be used in written English.
For example: "I was wondering if you could explain to me is that when I do this, will it..."
Dictionary
is that when
noun
Something being indicated that is there; one of those.
Exact(60)
One obvious danger is that, when the money does get spent, more could be wasted.
The disadvantage is that when it rains, it really rains.
The good news is that when parks close, people notice.
"The problem is that when someone is afraid of something, they usually just don't understand it".
What is that when measured against the loss of your father?
The trouble is that when you are famous, no one knows you're Belgian.
The thinking is that "when there is one person with his weapon on the street.
One thing I've noticed so far is that when you're a billionaire, you're never alone.
The point is that when misfortune befalls us, it's not helpful to mope around endlessly.
The danger of that is that when the zeitgeist moves on, you're stranded high and dry.
The assumption in Sudan is that when the referendum comes, southerners will vote overwhelmingly for secession.
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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