考察言语行为理论的概念。
Speech act theory includes locutionary act, illocutionary act, and perlocutionary act. locutionary act（发话行为,言内行为）is the act of uttering words, phrases, clauses. It is the act of conveying literal meaning by means of syntax, lexicon and phonology. An illocutionary act（行事行为，言外行为）is the act of expressing the speaker’s intention; It is the act performed in saying something. perlocutionary act（取效行为，言后行为）is the act performed by or resulting from saying something.