Certain sets of words in the English language tend to confuse writers. I have found the following to be among them:
WHO / WHOM
Who is in the nominative case and can serve as the subject of the sentence or as a predicate nominative; whom is in the objective case and can serve as direct object, indirect object, or object of a preposition.
Incorrect: You and whom else are going to spend the night in that haunted house?
Correct: You and who else are going to spend the night in that haunted house? (The pronoun who is standing in for part of the compound subject of the sentence here, so use the nominative case.)
Incorrect: And you would dare say that to who?
Correct: And you would dare say that to whom? (The pronoun whom serves as the object of the preposition to.)
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