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Discover LudwigThe phrase "Was that you?" is correct and is widely used in written English as well as spoken English.
For example: "I thought I heard someone calling my name, was that you?".
Dictionary
was that you
noun
Something being indicated that is there; one of those.
Exact(60)
She added, "If you didn't dodge them, well, that was that, you know".
Was that, you know, sort of a choice — and a bad one?
What was that you said?
And who was that "you"?
What was that you were saying, Sankaran?
The problem was that you need funding.
"The first rule was that you couldn't trust anybody.
Was that you?" "It may have been me, yes".
The truth, of course, was that you weren't really shrinking.
The challenge was that you knew they weren't".
Another was that you couldn't write about the restaurant.
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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