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Discover Ludwig"I don't know how" is correct and usable in written English
You can use it when expressing uncertainty or lack of knowledge about a particular process or method.
Example: "When it comes to fixing the car, I don't know how to start."
Alternatives: "I'm unsure how" or "I have no idea how."
Exact(60)
"I don't know how.
"I don't know how many, I don't know how often".
"I don't know how often.
Really, I don't know how.
"I don't know how many.
"I don't know how much.
I don't know how really.
I don't know how long.
I don't know how this all happened.
I don't know how accurate they are.
I don't know how it's holding together".
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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