Adjectives and adverbs are parts of speech that modify (or describe) other parts of speech and don't have meaning on their own. Adjectives modify nouns; qualifying adjectives (adjetivos calificativos) describe the noun's qualities and traits; and determinant adjectives (adjetivos determinativos) signal the noun's number, order, or location (determinant adjectives are identical to determinant pronouns, except in the way they are used in the sentence). Adverbs have four possible roles: an adverb may be used to modify a verb, an adjective, another adverb, or a verbal phrase.