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The phrase "not sure how to" is correct and usable in written English.
You can use it when expressing doubt or uncertainty in a situation. For example: "I'm not sure how to complete this task."
Exact(56)
And not sure how to evaluate them.
Carlson is not sure how to proceed.
Not sure how to balance your centrifuge?
"I'm not sure how to formulate this.
Not sure how to format your resume?
Not sure how to sample your soil?
I'm not sure how to take that.
Similar(4)
She is not sure how to answer.
[Laughs] [I'm] not sure how to describe it.
The truth is that I'm not sure how to respond.
Not sure how to eat your freshly peeled banana?
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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