A colloquialism is something most people use in ordinary, casual English. Educated people do not use 'should of', and would view it as as an error.
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Anonymousi seeWhen referring to yourself, always write a capital letter I.
AnonymousI maintain that this is an error, a common one, admittedly, but an error and nothing more.You are right. It's because the pronunciation of the "ve" part of "should've" is similar to, but not
AnonymousMistake or colloquialism?Mistake. Specifically, a mistake in writing.