I entered college in 1968. My freshman English class had a fairly old and well established grammar handbook. It has an introductory section on this sort of thing. I remember vividly one quote from it: If someone asks, "Can I go to the bathroom?", only an English teacher would not know what he meant.
Language evolves over time, and most changes improve it. The biggest problem with the English language is that it began as a rough mixture of several different languages with several different grammar system. As a result, we have different ways to form plurals (cows or oxen; boys, girls, and children), conjugate verbs, form past tenses, etc. Over the centuries we have been gradually evening it all out, slowly reducing the numbers of variations. It's a good thing.
I think post #11 made the best recommendation for this case.