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Discover Ludwig"what's that" is a correct and usable part of a sentence in written English.
It is used as a question to ask for clarification or to show curiosity about something. Example: "I saw something moving in the bushes. What's that?".
Dictionary
what's that
phrase
What is that?
Exact(60)
"What's that guy's name?
But what's that crackle?
CLINTON: What's that?
"What's that mean?
"What's that?" she asked.
Except... what's that?
"What's that?" I pointed.
"What's that?" "Duct tape.
"What's that?" she said.
What's that been like?
Wait...What's that?
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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