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Discover LudwigThe phrase "is that why" is a valid part of a sentence in written English.
It generally expresses a sense of curiosity - that the speaker is trying to understand why something is happening or why something is the way it is. For example, "I heard you hadn't been to the grocery store in weeks. Is that why you have no food in the house?".
Exact(60)
"Is that why I'm here in France?
Is That Why He Was Poisoned?
"Is that why he killed himself?" "No".
Why Is That?—Why Is That?
Is that why you chose it?
Oh, is that why?
And is that why females have a higher velocity?
Is that why Rousseff was being impeached?
Is that why it is first?
Is that why you're laughing?
Q: Is that why you're not traveling?
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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