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In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions (such as "one", "two", or "three or more").〔.〕 In many languages, including English, the number categories are singular and plural. Some languages also have a dual number or other arrangements. The count distinctions typically, but not always, correspond to the actual count of the referents of the marked noun or pronoun. The word "number" is also used in linguistics to describe the distinction between certain grammatical aspects that indicate the number of times an event occurs, such as the semelfactive aspect, the iterative aspect, etc. For that use of the term, see "Grammatical aspect". ==Overview== Most languages of the world have formal means to express differences of number. One widespread distinction, found in English and many other languages, involves a simple two-way number contrast between singular and plural (''car''/''cars'', ''child''/''children'', etc.). Discussion of other more elaborate systems of number appears below. Grammatical number is a morphological category characterized by the expression of quantity through inflection or agreement. As an example, consider the English sentences below: : ''That apple on the table is fresh.'' : ''Those two apples on the table are fresh.'' The number of apples is marked on the noun—"apple" singular number (one item) vs. "apples" plural number (more than one item)—on the demonstrative, "that/those", and on the verb, "is/are". In the second sentence, all this information is redundant, since quantity is already indicated by the numeral "two". A language has grammatical number when its nouns are subdivided into morphological classes according to the quantity they express, such that: #Every noun belongs to a unique number class (nouns are partitioned into disjoint classes by number). #Noun modifiers (such as adjectives) and verbs may also have different forms for each number class and be inflected to match the number of the nouns to which they refer (number is an agreement category). This is partly the case in English: every noun is either singular or plural (a few forms, such as "fish", can be either, according to context), and at least some modifiers of nouns—namely the demonstratives, the personal pronouns, the articles, and verbs—are inflected to agree with the number of the nouns to which they refer: "this car" and "these cars" are correct, while " *this cars" or " *these car" are ungrammatical and, therefore, incorrect. However adjectives are not inflected, and most verb forms do not distinguish between singular and plural. Only count nouns can be freely used in the singular and in the plural. Mass nouns, like "milk", "silverware", and "wisdom", are normally used in only the singular form.〔.〕 (In some cases, a normally mass noun ''X'' may be used as a count noun to collect several distinct kinds of ''X'' into an enumerable group; for example, a cheesemaker might speak of goat, sheep, and cow milk as ''milks''.) Many languages distinguish between count nouns and mass nouns. Not all languages have number as a grammatical category. In those that do not, quantity must be expressed either directly, with numerals, or indirectly, through optional quantifiers. However, many of these languages compensate for the lack of grammatical number with an extensive system of measure words. There is a hierarchy among number categories: no language distinguishes a trial (indicating the number 3) unless having a dual, and no language has dual without a plural. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Grammatical number」の詳細全文を読む スポンサード リンク
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