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Discover Ludwig"not sure" is a valid phrase for written English
You can use it to express uncertainty about your opinion or the accuracy of a statement. Example: I think the answer is five, but I'm not sure.
Exact(60)
"Not sure, not sure.
"Not sure," Kiehl said.
Not sure what.
"Not sure," I said.
"Not sure yet".
Not sure where.
Not sure, really.
Not sure," he said.
Not sure that works.
Not sure.
Not sure which game.
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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