This it usually does by indicating some quality.
An adjective is said to belong to the substantive which it describes or limits.
An adjective which describes is called a descriptive adjective; one which points out or designates is called a definitive adjective.
(4) A verb is a word which can assert something (usually an action) concerning a person, place, or thing.
Some verbs express state or condition rather than action.
A group of words that is used as a verb is called a verb-phrase.
Certain verbs, when used to make verb-phrases, are called auxiliary (that is, “aiding”) verbs, because they help other verbs to express action or state of some particular kind.
Is (in its various forms) and several other verbs may be used to frame sentences in which some word or words in the predicate describe or define the subject. In such sentences, is and other verbs that are used for the same purpose are called copulative (that is, “joining”) verbs.
(5) An adverb is a word which modifies a verb, an adjective, or another adverb.
A word or group of words that changes or modifies the meaning of another word is called a modifier.