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The sentence "I should know" is correct and usable in written English
You can use this phrase when you are uncertain about something and is implying that you should have an understanding of the situation, or when you acknowledge the necessity of having knowledge. For example: "I don't know where the nearest grocery store is, I should know since I live here."
Exact(58)
I should know that.
And I should know.
Trust me; I should know.
Anything else I should know?
–MB I should know.
Is this something I should know about?
O.K., is there anything I should know?
I should know, having done it.
I should know - I hired them".
"Anything I should know about?" she asked.
I should know, of course.
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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