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Discover LudwigThe phrase "didn't know how" is correct and can be used in written English.
You can use it to express uncertainty, confusion, or lack of understanding. For example: "He didn't know how to respond to the question, so he just sat there in silence".
Exact(60)
"He didn't know how".
I didn't know how".
They didn't know how?
I just didn't know how".
didn't know how to respond.
You didn't know how.
They didn't know how to leave.
"I just didn't know how many".
I didn't know how adults thought.
"I didn't know how they throw.
I didn't know how to respond.
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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