To Whom It May Concern On the road these summer days, you might encounter a very confusing car magnet. It is confusing not in its message but in its grammar. "Who" is a subject pronoun, meaning it should only replace the subject of a sentence – in this case, the person or animal doing the rescuing. It cannot replace the object of a sentence – in this case, the person or animal being rescued. What is needed is an object pronoun, namely, "whom." And so the magnet should read, "Who rescued whom?" "Who" and "whom" are a source of endless confusion in [...]