Can you give me an example of predicate noun?

The predicate noun (or predicate nominative) is the noun or a pronoun following a linking verb that restates or stands for the subject. Examples:

My sister's name is Edith. (name = Edith)

Mother was a teacher before I was born. (mother = teacher)

Jacob was elected class president. (Jacob > president)

Janet is the one who called. (Janet = one)