The case-form used to mark a grammatical subject.
In English, only a few pronouns distinguish case. For example, the first person singular pronoun has nominative I, as opposed to the objective form me.
Other examples are given below.
he (nominative)/him (objective)
she (nominative)/her (objective)
Other pronouns, like you, it and what, are invariable in form.
The case form used with certain pronouns to mark a non-subject.
In English, only the following pronouns distinguish a nominative form (the subject form) from the objective form: I (nominative)/ me (objective); he/him; she/her, they/them; we/us and who/whom.
Other pronouns, like you, it and what, are invariable in form. The objective is sometimes called the accusative.