First, the relationship between the negative sentence and the correction clause of a PCN is quite different from that of an MN. While the follow-up clause in a PCN provides the reason for denying the existence of the entities or event presupposed by asserting the 3.2 Implicature under negation
Among MNs, ICN shows characteristic similar to those of PCNs. First, an utterance’s implicates [specifically generalized conversational implicates in Levinson’s [2000 terms] sometimes constitute the truth-evaluable content of an utterance. The following would be a typical example: