The Nominative Case.

A Noun or pronoun that is the Subject of a Verb, e.g.

1. The policeman caught the thief. (What caught? The policeman)

2. The pen was stolen by him. (What was stolen? The pen)

3. He told a lie (who told? He)

The Nouns “policeman”, “pen” and the Pronoun “He “ are in the Nominative Case.