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Discover LudwigThe phrase "am not sure" is not correct in standard written English as it lacks a subject.
You can use it in informal contexts, but it should be preceded by a subject like "I" to be grammatically correct.
Example: "I am not sure if I can attend the meeting tomorrow."
Alternatives: "I'm uncertain" or "I have doubts."
Exact(55)
But I am not sure.
I am not sure why.
I am not sure that it does.
"Actually I am not sure," he said.
I am not sure why this happened.
"I am not sure about that".
Similar(5)
A.I'm not sure.
She was not sure.
He's not sure.
He was not sure.
I was not sure.
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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