English tip: Sometimes, when we have a piece of good news to share, we get excited and we may start by saying “Guess what”. Now- the question is– do we add a question mark or a period after “guess what”? In this scenario, “guess what” is an imperative (a command/request) so it is conventionally punctuated with a period, not a question mark. For example: Guess what. I won the top prize for the lucky draw.