Grammatical Category

In linguistics, a grammatical category or grammatical feature is a property of items within the grammar of a language. Within each category there are two or more possible values (sometimes called grammemes), which are normally mutually exclusive. Frequently encountered grammatical categories include:
* Tense, the placing of a verb in a time frame, which can take values such as present and past
* Number, with values such as singular, plural, and sometimes dual, trial, paucal, uncountable or partitive, inclusive or exclusive
* Gender, with values such as masculine, feminine and neuter
* Noun classes, which are more general than just gender, and include additional classes like: animated, humane, plants, animals, things, and immaterial for concepts and verbal nouns/actions, sometimes as well shapes
* Locative relations, which some languages would represent using grammatical cases or tenses, or by adding a possibly agglutinated lexeme such as a preposition, adjective, or particle.

Although the use of terms varies from author to author, a distinction should be made between grammatical categories and lexical categories. Lexical categories (considered syntactic categories) largely correspond to the parts of speech of traditional grammar, and refer to nouns, adjectives, etc.

A phonological manifestation of a category value (for example, a word ending that marks "number" on a noun) is sometimes called an exponent.

Grammatical relations define relationships between words and phrases with certain parts of speech, depending on their position in the syntactic tree. Traditional relations include subject, object, and indirect object.

Assignment and meaning

A given constituent of an expression can normally take only one value in each category. For example, a noun or noun phrase cannot be both singular and plural, since these are both values of the "number" category. It can, however, be both plural and feminine, since these represent different categories (number and gender).

Categories may be described and named with regard to the type of meanings that they are used to express. For example, the category of tense usually expresses the time of occurrence (e.g. past, present or future). However, purely grammatical features do not always correspond simply or consistently to elements of meaning, and different authors may take significantly different approaches in their terminology and analysis. For example, the meanings associated with the categories of tense, aspect and mood are often bound up in verb conjugation patterns that do not have separate grammatical elements corresponding to each of the three categories; see Tense–aspect–mood.

Manifestation of categories

Categories may be marked on words by means of inflection. In English, for example, the number of a noun is usually marked by leaving the noun uninflected if it is singular, and by adding the suffix ''-s'' if it is plural (although some nouns have irregular plural forms). On other occasions, a category may not be marked overtly on the item to which it pertains, being manifested only through other grammatical features of the sentence, often by way of grammatical agreement.

For example:

The bird can sing.
The birds can sing.

In the above sentences, the number of the noun is marked by the absence or presence of the ending ''-s''.

The sheep is running.
The sheep are running.

In the above, the number of the noun is not marked on the noun itself (''sheep'' does not inflect according to the regular pattern), but it is reflected in agreement between the noun and verb: singular number triggers ''is'', and plural number ''are''.

The bird is singing.
The birds are singing.

In this case the number is marked overtly on the noun, and is also reflected by verb agreement.

However:

The sheep can run.

In this case the number of the noun (or of the verb) is not manifested at all in the surface form of the sentence, and thus ambiguity is introduced (at least, when the sentence is viewed in isolation).

Exponents of grammatical categories often appear in the same position or "slot" in the word (such as prefix, suffix or enclitic). An example of this is the Latin cases, which are all suffixal: ''rosa, rosae, rosae, rosam, rosā'' ("rose", in the nominative, genitive, dative, accusative and ablative).

Categories can also pertain to sentence constituents that are larger than a single word (phrases, or sometimes clauses). A phrase often inherits category values from its head word; for example, in the above sentences, the noun phrase ''the birds'' inherits plural number from the noun ''birds''. In other cases such values are associated with the way in which the phrase is constructed; for example, in the coordinated noun phrase ''Tom and Mary'', the phrase has plural number (it would take a plural verb), even though both the nouns from which it is built up are singular.

Grammatical category of noun

In traditional structural grammar, grammatical categories are semantic distinctions; this is reflected in a morphological or syntactic paradigm. But in generative grammar, which sees meaning as separate from grammar, they are categories that define the distribution of syntactic elements. For structuralists such as Roman Jakobson

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