Recent literature has presented a serious challenge for propositional accounts of content. It has been argued that certain bits of natural language discourse, in particular, modal claims, pose a fundamental challenge for propositional accounts, as they fail to express propositional content even relative to a context. The puzzling linguistic behavior of modal discourse suggests that context simply cannot determine propositional content for such claims. This appears to call for a re-thinking of the interaction between context and content, and their role in communication. Indeed, various non-propositionalist accounts that have been proposed to capture this puzzling behavior call for such re-thinking. Such accounts have received various implementations, for instance, in various expressivist and dynamic update semantics. These accounts deny that modals express ordinary propositional content, and they also deliver a non-classical logic. This chapter introduces the challenge, and the main features of non-propositional accounts that have been proposed as a solution.
Diachronic Semantic Shift of Sequential Conjunction: the Causal to Conditional Path