
Be not to know
Ignorance Innocence
Indicates innocence due to a lack of information.

He broke the vase but I'm not to know, as I wasn't there.
Avoiding Blame
Used to express that you can't be blamed for something you were unaware of.

I am not to know the rules if they were never explained to me.
Not Expected
Stresses that it was not reasonable to expect the person to have the information.

As an outsider, I am not to know the family's traditions.
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