The nominative case

Nouns and pronouns (I, you, he, she, it, we, and they, to name a few) used in
the nominative case function as subjects and predicate nominatives in
sentences.

Subject examples:
Patsy read the newspaper.
I can assist you with the project.
They will be doing the least favorite part of the job.
Predicate nominative examples:
The new champion is Tony.
The new leader is he.
Their choices for club leaders are you and Juanita.
Note: In all cases, an appositive is in the same case as the word it refers to in
the sentence. Thus, in certain situations, an appositive is in the nominative
case.

We neighbors must rely upon one another. (Because we refers to the
sentence’s subject, neighbors, we is in the nominative case.)
The witnesses are we people. (Because we refers to the sentence’s
predicate nominative, people, we is in the nominative case.)
The proposal’s writers, Jess and Tess, were present. (Jess and Tess are
the appositives and are in the nominative case.)