------------------------------------- The name's Peter. From New Jersey. 22 years old. Absurdly sarcastic. Read much more in my "about me" by clicking on the link below. =) Side note: Many people are wondering why there are no "non-anon" questions on my blog. It's because I answer them privately so my blog doesn't get overwhelmed with questions. Side side note: I don't do promos. Side side side note: I don't reblog unless the post is something I really feel needs to be seen.
This is definitely one of the tougher grammar rules. The best way to remember is to think of the two words as replacements. Who replaces he or she, and whom replaces him or her.
Consider the following example for who: “Who wrote that story?” You know you must use who because you can answer that question by saying: “He/She wrote that story.” You certainly wouldn’t say: “Him wrote that story,” so you know “whom” would be incorrect.
Consider the following example for whom: “Whom are you going out with tonight?” You know you must use whom because you can answer that question by saying: “I’m going out with him/her.” Saying: “I’m going out with he/she” is obviously incorrect, so you know you shouldn’t use “who.”
It takes a while to get used to, but I hope that at least somewhat clears things up.