Information about Grammatical Categories

In linguistics, the grammatical aspect of a verb defines the temporal flow (or lack thereof) in the described event or state. For example, in English the difference between I swim and I am swimming is a difference of aspect.
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In linguistics, many grammars have the concept of grammatical mood (or mode), which describes the relationship of a verb with reality and intent. Many languages express distinctions of mood through morphology, by changing (inflecting) the form of the verb.
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In grammatical theory, definiteness is a feature of noun phrases, distinguishing between entities which are specific and identifiable in a given context (definite noun phrases) and entities which are not (indefinite noun phrases).
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Animacy is a grammatical category, usually of nouns, which influences the form a verb takes when it is associated with that noun.

Usually, animacy has to do with how alive or how sentient the referent of a noun is.
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In linguistics, evidentiality is, broadly, the indication of the nature of evidence for a given statement, that is, whether evidence exists for the statement and/or what kind of evidence exists.
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In linguistics, the term noun class refers to a system of categorizing nouns. A noun may belong to a given class because of characteristic features of its referent, such as sex, animacy, shape, but counting a given noun among nouns of such or another class is often clearly
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In linguistics, grammatical genders, sometimes also called noun classes, are classes of nouns reflected in the behavior of associated words; every noun must belong to one of the classes and there should be very few which belong to several classes at once.
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grammatical number is grammatical category of nouns, pronouns, and verb agreement that expresses count distinctions (such as "one" or "more than one").^[1]
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Grammatical polarity indicates the truth or falsehood of a statement, or negation. There are two grammatical polarities, negated and not negated. In English, grammatical polarity is generally indicated by the presence or absence of the modifier not
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Transitivity is a grammatical category in some languages ^{[1] [2]}. For example, the verb which has an object (called a transitive verb) takes on another paradigm, than the verb which has no object (called an intransitive verb).
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In grammar, the voice of a verb describes the relationship between the action (or state) that the verb expresses and the participants identified by its arguments (subject, object, etc.). When the subject is the agent or actor of the verb, the verb is in the active voice.
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Grammatical person, in linguistics, is deictic reference to the participant role of a referent, such as the speaker, the addressee, and others. Grammatical person typically defines a language's set of personal pronouns.
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In languages, agreement is a form of cross-reference between different parts of a sentence or phrase. Agreement happens when one word changes in form depending on which other words it is being related to.
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In linguistics, grammatical functions or grammatical relations refer to syntactic relationships between parts of speech such as subject, object, adjunct, complement.
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