Abstract

Paul Portner and Aynat Rubinstein’s chapter shows that there are strong parallels between strong and weak necessity modals (‘must’ vs ‘should’, ‘crucial’ vs ‘important’), on the one hand, and extreme and non-extreme gradable adjectives (‘big’ vs ‘huge’), on the other. Several approaches to extreme and non-extreme expressions are reviewed before an extension of Morzycki’s 2012 degree-based theory of extreme adjectives to the modal domain. The analysis defended in this chapter is based on a method of constructing scales for necessity modals based on premise semantics, and it allows new insights into the pragmatic difference between the two types of necessity modals. The key insight is that extreme deontic modals are ‘extreme’’ in that they relate to degrees which are built using premises not at issue in the conversation.