She helped us , Jeff and me . You have visited him before. The losers are you and he . It could have been they . Personal pronouns have what is called case .
Case means that a different form of a pronoun is used for different parts of the sentence.
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 . They are used as direct objects, indirect objects, objects of the preposition, and appositives when used with one of the objects. You and it are both nominative and objective case.