Weegy: Grammatically, 'who' can be used as subject or object, though a traditional grammarian will tell you to use it in subject position only. [ 'whom' on the other hand can ONLY be used in object position, it is ungrammatical to use it in subject.
(If you don't understand subject and object, look them up in a dictionary under their linguistic definition, or better yet look it up in a grammar dictionary.)
Of course, no ESL kid will get that. ... (More)