Final answer:
An adjective is used by a writer to show the logical relationship between a noun or a pronoun and another word in a sentence.
Step-by-step explanation:
An adjective is used by a writer to show the logical relationship between a noun or a pronoun and another word in a sentence. It provides more information about the noun or pronoun. For example, in the sentence 'The red car is fast,' the adjective 'red' describes the noun 'car' and shows its relationship to the word 'red.'
Learn more about role of adjectives in sentence structure