Question

Which word in the sentence is a subject complement?

Answer 1

The answer is a first 

Answer 2

The correct answer is option A, first

The complement of subject can be an adjective, noun and pronoun that follows a linking verb. Linking verb can be  : is , am , are, was, were, has been , is/are being, might have been etc.

Here in this sentence the linking verb is was which is predecessor to the word “first person” and thus “first” can be stated as complement of a subject.