QUESTION: When should you use "who" and when should you use "whom"? And should that question mark be INSIDE that closing quotation mark or outside? (answer below)
ANSWER: Use "who" as a subject, and "whom" as an object (when there is already a subject). Examples: "Who shall I say is calling? (Who is the subject of is calling.)" "Mom and Dad, this is Penelope, whom I'm going to marry tomorrow." And that question mark goes outside the quotation mark almost always. Exception: When the question itself is part of the quotation.