If an interrogative pronoun has an antecedent, it is usually the answer to the question:
- Whatis today? Today is the fifth of the month.
- Which woul you like? I would like the lemon, please.
- Who is your math teacher? I hve Mr. Smith. (In this case both can be considered an antecedent.)
- To whom should I give my application form? I don't know. (No antecedent here.)
