Predicate adjectives (PAs) and predicate nouns (PNs) are words that follow linking verbs and describe the subject of the sentence. Linking verbs connect the subject to another word by expressing a state of being rather than an action. Common linking verbs include forms of be, seem, become, and feel. PAs are adjectives that describe the subject, while PNs are nouns that rename the subject. Both PAs and PNs only follow linking verbs and not action verbs.