DEAR ABBY: Is it acceptable for one adult to correct another's English unless asked to do so?
My sister does it frequently, and I want to know if it's rude so I don't make the same blunder. -- GRAMMATICALLY YOURS IN NEW ORLEANS
DEAR GRAMMATICALLY YOURS: It isn't rude if it is done tactfully, in private and in the spirit of being helpful. If it's done as a form of one-upmanship, it is obnoxious.