In which sentence is the word fish used as a predicate nominative?

a. Fish are some of the most interesting animals on Earth.

b. Tamara will fish at the seacoast this summer.

c. Sea horses are very unusual fish.

d. Will you buy some good fresh fish for dinner?

C. Sea horses are very unusual fish.

The word "fish" is a predicate nominative in letter C sentence. This is because a predicate nominative, also known as subject complement, is a noun or pronoun that follows a linking verb and renames the subject.

Sea horses - subject; are - verb; very unusual - adjectives; fish - predicate nominative.

A - Fish - subject

B - will fish - verb

D - fish - object