A. combines an imperative logic (with the imperative operator 'Let it be the case that') and an epistemic logic (with the epistemic operator 'I know that') to account for interrogatives, so that a question such as 'Is linguistic philosophy still alive?'can be analyzed as 'Let it (turn out to) be the case that either I know that linguistic philosophy is still alive or I know that linguistic philosophy is not alive any longer'. To abbreviate this formula, question-forming operators are introduced. The text contains a chapter on the presuppositions of questions.