Noun as Subject Complement (Predicate Nominative)
The Functions of Nouns in Sentences. Examples. Quiz

Subject Complement (also Predicate Nominative or Predicate Noun) comes after a linking verb (to be, to become, to remain) and is equivalent to the subject but renames it in different terms (gives more information about the subject, such as a condition or relationship).

In the following examples, subject is underlined and Subject Complement shown in color.

1. My friend is a doctor.
2. Mike will remain the president of the company.
3. The horse has been a powerful symbol in nearly every culture and every age.
4. My son became a professional basketball player.
5. Michael Jackson was a great singer.
6. Make and John are baseball players.
7. George Washington was the first president.
8. The tall boy has been our best player.
9. Mike may be our next president.

Note: linking verb does not show any action. It simpy links the subject of a sentence with the rest of the sentence. Examples of linking verbs: am, are, is, was, were, be, being, been, remain, become, may be, used to be, etc.
See English Verbs for more explanation and samples.