  Austin distinguishes illocutionary acts into five categories: verdictives (in which a speaker gives a verdict, e.g. acquitting and diagnosing), exercitives (in which speakers exercise powers, rights or influence, e.g. excommunicating and resigning), commissives (in which speakers commit themselves to causes or courses of action, e.g. promising and betting), behabitives (concerning attitudes and social behavior, e.g. apologizing and toasting), and expositives (in which speakers clarify how their utterances fit into lines of reasoning, e.g., postulating and defining).