Presupposition without common ground
In this paper, I review a number of arguments in favor of treating many of the central cases of presupposition as the result of conversational inference, rather than as lexically specified properties of particular expressions. I then argue that, despite the standard assumption to the contrary, the view of presupposition as constraints on the common ground is not consistent with the provision of a conversational account of particular presuppositional constraints. The argument revolves crucially around the workings of accommodation. I then offer an alternative view of the phenomenon of presupposition, which is compatible with a variety of sources for presuppositions. On the view offered here, presupposition is seen as a property of utterances. I argue that the presuppositions of an utterance are those propositions which an interpreter must take the speaker to accept in order to take the speaker to be fully cooperative, in the Gricean sense.