I - subject 2. He - subject 3. They - subject 4. She - subject 5. Personal pronouns have what is called case .
Case means that a different form of a pronoun is used for different parts of the sentence.
Many mistakes are made in the use of nominative and objective case pronouns. Memorizing each list will help you use them correctly. Nominative case pronouns are I, she, he, we, they, and who . They are used as subjects, predicate nominatives, and appositives when used with a subject or predicate nominative. Objective case pronouns are me, her, him, us, them, and whom .