When do you use a pronoun with "po"? Here are some sample sentences: 1) Kamusta po kayo sir? (How are you sir?) 2) Puwede po bang pakihintay sir? (Is it possible to wait sir?) In 1) a pronoun and po are both used. In 2) only a pronoun is used. Are there any guidelines for this? Could you say: Puwede po ba ninyong pakihintay sir? (Is it possible for you to wait sir?)