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Discover LudwigThe phrase "That's impossible" is correct and usable in written English
You can use it when something seems so unlikely that you think it can't be done. For example, you might say, "My boss asked me to get the project finished by the end of the day—that's impossible!"
Exact(58)
Ha! That's impossible!
It's a proposition that's impossible to quantify.
"That's impossible," she said.
"That's impossible!" I exclaimed.
"That's impossible," Lubert said.
"That's impossible," Tynes said.
That's impossible, of course.
"That's impossible," they'll reply.
That's impossible!" Joey insisted.
That's impossible to say.
That's impossible right now.
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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