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Discover LudwigThe phrase "why on earth" is a correct and usable phrase in written English.
You can use it to express surprise or shock about a situation. For example: "Why on earth would she do something like that?".
Dictionary
why on earth
interjection
Used to add emphasis to "why" when beginning a question.
Exact(60)
Why on earth expend it on Gaza?
Why on earth is it in Geneva?
"Why on earth can't we do something comparable in England?
Why on earth not?
Why on earth?
Why on earth would we?
Why on earth would you?
Why on earth would Tesla do that?
"Why on earth did they do it?
Why on earth did they jump in?
But why on earth had I started?
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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