A predicate nominative is a word that renames the subject of a sentence. Always use a noun for the predicate nominative. Look at this sentence:
Sam is a doctor.
The subject of the sentence is Sam. The predicate nominative is doctor. The noun doctor renames the subject Sam.
Here are more examples of the predicate nominative:
Mom is a teacher.
Mr. Smith is our neighbor.
My brother is an engineer.
Bobby is a kindergartner.
A predicate nominative renames the subject of the sentence. The predicate nominative is always a noun.
▶It’s your turn. Find the predicate nominative in this sentence. My grandpa is a farmer. Did you choose the noun that renames grandpa? Good for you.