the grammatical term number is the name of the system contrasting singular and plural. in english, number agreement is not expressed through agreement of verbal elements like they are in other languages. this is partly because english is a language that requires subjects and the subjects in english overtly express number. instead, english number is a phi-feature that is inflected on nouns when the nominal phrase is plural. the most common in english is "-s" inflected on nouns that are plural:- ducks, fridges, baseballs, cups, books, mirrors, cars, buildings, clowns, bridges, creams...some cases of plurality in english require conjugation of the entire noun to express the phi-feature of plurality:- men, women, mice, teeth...neither verbs nor adjectives are used to agree with the number feature of the noun that they are agreeing with in english.