 After going over some preliminaries we will focus on three lines of work on questions: one located at the intersection of philosophy of language and formal semantics, focusing on the semantics of what Belnap and Steel (1976) call elementary questions; a second located at the intersection of philosophy of language and philosophy of science, focusing on why-questions and the notion of explanation; and a third located at the intersection of philosophy of language and epistemology, focusing on embedded questions.