All of this really shows that you should not use contractions. "Should'of" is grammatically nonsensical, but it is the most common mistake children make both speaking and writing. You really have to make sure they don't get the two confused, or it can mean a lifetime of error.
I have an unfair advantage over pretty much everyone in the world though, I have a clerkly (i.e. educated, not posh) Hampshire/Surrey accent; more or less the defnition of "Standard English".
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