Keelefilosoofia raamat
does not state or describe anything--for example, "I apologize" or (in a game
of bridge) "I double." The kinds of acts that can be performed in this way are
called speech acts. Each type of speech act is governed by rules of two sorts:
constitutive rules, which must be obeyed if the act is to have been accom-
plished at all, and regulative rules, violation of which merely renders the act
defective or, in Austin's word, infelicitous. There are many and surprisingly
various ways in which a given speech act can be infelicitous.
But Austin came to see that there is no principled distinction between
performative utterances and those of ordinary declaratives. Rather, every
utterance has a performative aspect or illocutionary force, which determines
the type of speech act performed, and virtually every utterance has a descrip-
tive or propositional content as well. Further, many utterances have features
annaabi.ee 
