Isn’t “have” either an auxiliary verb or verb and “of” a preposition?

Are these acceptable? If yes, why? If not, why not?

• I of heard that story before.

• Diane of already gone.

• John ofn’t phoned, of he?

• I ofn’t visited London before.

• Of you seen Roz?

• Of she been invited?

• They still ofn’t of any news when I spoke to them yesterday.

I don’t know man, Oxford Dictionary (click Grammar Point to expand) says that https://www.oxfordlearnersdictionaries.com/definition/english/have_2

A common mistake is to write ‘could of’ instead of could have or could’ve

I could of told you that.

I could’ve told you that.

The reason for the mistake is that the pronunciation of ’ve is the same as that of of when it is not stressed. This is a common error but it is definitely considered wrong in standard English.