1.     Definition
Speech  acts  theory  is  the  theory  in  the  field  of  pragmatics. In general, speech acts are acts of communication (Bach  1979). To communicate is to express a certain attitude, and the type of speech act being performed corresponds to the type of attitude being expressed. As an act of communication, a speech act succeeds if the audience identifies, in accordance with the speaker's intention, the attitude being expressed.