When to use "who" & when to use "whom"?

Question

I've been out of school for quite some time. I don't remember, is there a simple rule for knowing when to use one or the other?

Answer 1

Yes. 'Who' is a subject and 'whom' is an object. Use 'who' where you would use 'he' or 'she' and 'whom' where you would use 'him' or 'her'.

It takes a little getting used to, but once you train your mind to remember it starts to come naturally.

Answer 2

Who is a subject; whom is an object. You ask , "Who are you?" You say, "To whom am I speaking?" Whom is always preceded my a preposition. Got it? I'm a little rusty, too, but I think I've given you good instructions, but who am I to tell you? Who knows? With whom are you having lunch? Who does your hair? Who is your best friend? With whom may I leave this package? About whom are you speaking? Who is at the door? Gotta go see!