We claim that weak necessity modals like English "should" are referential
expressions that denote pluralities of worlds, contra the standard
analysis, according to which all modal auxiliaries are quantifiers. Weak
necessity modals pattern like plural definites when tested for homogeneity
effects (Löbner 2000, Križ 2016): they have scopeless readings under
negation, they tolerate exceptions in certain
discourse contexts, and they exhibit other properties characteristic of
homogeneous definite plurals. We also discuss how to extend this analysis
to languages in which weak necessity modals are built compositionally from
strong necessity modals by adding subjunctive morphology.