In simple terms, a predicate adjective follows a linking verb and modifies the subject of a sentence. The most common sentence structure using this type of adjective is:
[Subject] + Linking Verb + Predicate Adjective
More information can come after the adjective, but let’s keep things light for now. We start the sentence with the subject, use a linking verb to make a connection with a description, and finish the thought with that description.
For Example: The skyscraper is tall.
“The skyscraper” would be the subject of the sentence, “is” would be the verb, and “tall” is the predicate adjective. Notice how “is” connects the idea of the skyscraper with whatever follows, in this case “tall.”
Another example:: The lake seemed peaceful today.
Here the predicate adjective in this example is “peaceful,” which describes how the lake “seemed”.