Case refers to the different forms that nouns and pronouns take to deliver information. The case of a noun or a pronoun communicates how that word relates to other words in a sentence. For example, I, me, and mine are three different cases of the singular first-person pronoun. (I wanted a small wedding, but my parents asked me to invite all their friends. Unlike my sister's wedding, mine was quite large.)
English has three cases: subjective, objective, and possessive.
Personal pronouns are the most common type of pronouns. They have a full range of cases that show changes in person (first, second, and third person) and number (singular and plural).
CASE OF PERSONAL PRONOUNS
|Person||sing. plur.||sing. plur.||sing. plur.|
|First||I we||me us||my/mine|
|Second||you you||you you||your/yours your/yours|
A pronoun in the subjective case
functions as a subject.
We were going to be married.
[We is the subject.]
John and I wanted an inexpensive band to play at our wedding.
[I is part of the compound subject John and I.]
He and I found a one-person band we could afford.
[He and I are compound subjects.]
A pronoun in the objective case
functions as a direct object, an indirect object, or the object of a preposition.
We saw him perform in a public park.
[Him is the direct object.]
We showed him our budget.
[Him is the indirect object.]
He understood and shook hands with me.
[Me is the object of the preposition with.]
A pronoun in the possessive case
indicates possession or ownership.
The musician's contract was in the mail the next day.
[Musician's, a noun in the possessive case, indicates ownership.]
Our signatures quickly went on the contract.
[Our, a pronoun in the possessive case, indicates possession.]