 Words like ‘someone’, and the grammatical requirement that ‘every’ must be followed by a noun (or noun phrase), suggest that natural language employs restricted quantifiers. Phrases like ‘every boy’ are composed of a determiner and a noun. Correspondingly, one can think of determiners as expressions that can combine with an ordered pair of predicates to form a sentence, much as one can think of transitive verbs as expressions that can combine with an ordered pair of names to form a sentence. And this grammatical analogy, between determiners and transitive verbs, invites a semantic correlate.