Speech acts : when words are actions. Actions: ordering, promising, apologising, warning, sentencing, christening, marrying.
Two separate parts of speech: Constantive ("is"): sentences that describe something as true or false. Performative ("does"): sentences that denote an action. They depend on context and reception. These are known as felicity conditions:AuthoritativeUnderstoodClearAble to be executed
If the performative doesn't meet these conditions, then it doesn't have the power to denote action. But just because a performative meets its conditions and is clearly stated doesn't mean that it's implicity followed.