 Who vs whom? This is another set of words that are easily confused by people. Let's break it down. Who is used to refer to the subject of the sentence? Whom on the other hand refers to the object? The usage of this pair is the same as he and him. Therefore, there is a very easy trick to figure out which word is correct. Would you use he or him here? Yes, he. So if he is correct, so is who. Who did this? He did. What about this one? Which one is correct? Should I invite he or should I invite him? Him is correct and therefore so is whom. Whom should I invite? Also keep in mind that you do not use that to refer to people. Therefore, he was the only person that came is incorrect. He was the only person who came is correct. Next time try to use the he or him trick to find the correct answer to the who and whom question. That's it for today. See you next time.