This document discusses the distinction between constative and performative utterances as described by J.L. Austin. Constatives are statements that can be true or false, such as "the window is open." Performatives are utterances that perform an action, like orders, promises, and bets. Implicit performatives do not specify the speech act, while explicit performatives use performative verbs like "I promise." Performatives can be happy if well-chosen or unhappy if inappropriate. The key difference is that constatives report or describe while performatives perform an action in saying something.