Adjectives are words that describe or modify nouns. They can describe qualities, states of being, or quantities of nouns. Adjectives tell readers how much, how many, which, or what kind of something is being referred to. Adjectives usually precede the nouns they modify and can also follow linking verbs. They can be used attributively or predicatively and many take comparative and superlative forms. Adjectives are classified as central if they can function attributively and predicatively, or peripheral if they are restricted to only one function.