1.Presuppostitionrn1.1 The definition of presuppositionrnThe widely-studied subject in linguistic-presuppositionhas originated from philosophy field, in which thephilosophers used this concept for the research of thephenomena of projection and the words of reference innatural language. In Pragmatics, George Yule (2000) said thata presupposition is something the speaker assumes to be thecase prior to making an utterance. In another words, apresupposition is a proposition which is assumed to be truein advance when the speaker makes an utterance. Thoughthe sentence is negated, the presupposition remains true.