Abstract

Some modal expressions in language—for example, "can" and "able'"—describe what is possible in light of someone's abilities. Ability modals are obviously related to other modalities in language, such as epistemic or deontic modality, but also give rise to anomalies that make them unique. This paper develops a general theory of ability modals that is broadly compatible with standard modal semantics, while predicting their peculiar behavior. The central idea is that ability modals include reference to a notion of dependence. At the level of truth conditions, "S is able to A" simply says that there is a circumstantially accessible world where S As. On top of this, a not-at-issue element requires that whether S As depends, in part, on intrinsic features of S. Differently from most analyses, this account divorces ability modals from a notion of agency.