The grammatical number is the name of the system that contrasts the singular and the plural.  In English, the correspondence of numbers is not expressed by the concordance of verbal elements as they are in other languages (although the number references correspond to third-person subjects). This is partly because English is a language that requires subjects and subjects in English seem to express the number. Instead, the English number is a Phi characteristic that is bent over nouns when the noun phrase is plural. The most common in English is -s on nouns that are plural: Branigan, Phil and Marguerite McKenzie. 2002. Altruism, A-Bar movement and object agreement in Innu-Aimûn. Language Exam 33: 385-407. Chomsky first suggested that the N-Node in a clause has all the characteristics to include the person, number, and gender.  In English, we rely on names to determine the Phi characteristics of a word, but some other languages rely on the flexions of different parts of the language to determine the person, number, and gender of the nominative phrases to which they refer. Verbs and adjectives are primarily responsible for wearing inflections that signal the Phi characteristics of a particular subject or object. Verbs seem to be responsible for carrying most characteristics and tend to carry the understandings between people, numbers, and genders, for both subjects and objects.
 Adjectives also have characteristics of Phi in some languages, but they tend to agree in number and gender, but rarely for the person.  This analysis indicates that the category is determined by syntax or context. A base word is inserted as naked in the syntax and the surrounding syntax determines whether it behaves like a verb or a noun. Once the environment has determined its category, morphological flexions also appear on the root according to the specific category. If the before element is a determinator, the word is normally used as a noun, and if the before element is a temporal element, the root word is used as a verb.  The example in the photo shows an example of Italian. The root of the word is cammin- (“to go”). This word could appear either as a noun or as a verb. The first tree shows that if the front element is a D “una”, the root is an N and the next -ata morphology flies away, which is the correct complete spelling for the name “walk” in Italian. Functional categories and agreement.
The Linguistic Review 8: 353-387. le Dikken, M. Phi-feature inflection and agreement: An introduction. Nat Lang Linguist Theory 29, 857-874 (2011). doi.org/10.1007/s11049-011-9156-y In English, the correspondence of people is understood literally in the pronoun or noun, while the verb bears the match marker to match the characteristics of the person-Phi on the noun. For English, it is enough to match the third person singular in the present (usually -s), as can be seen in the table: In linguistics, especially in generic grammar, the characteristics of Phi (referred to as “phi” in Greek φ) are the semantic characteristics of the person, number, sex, and lowercase, as they are encoded in pronominal agreement with nouns and pronouns (the latter should consist only of Phi characteristics, e.g. without a lexical head). .