I cannot understand why so many well-educated persons use some variation of, "If I would have known" which is the most illiterate expression I know. The correct wording in all cases is never "If I would have" but, "If I had". How difficult is that? Never say, "If I would have been told", "If I would have studied more","If I would have been around", or any expression with "If I would have." It's aways wrong" and always sounds uneducated. So if you pride yourself on having a good command of English, dump this misuse and adopt, "If I had"