Case refers to the state a noun or pronoun takes depending on its function or role in a sentence. English pronouns have three cases. They are subjective, objective, and possessive.
Use Of Subjective Pronouns
The subjective (or nominative) pronouns are I and you (singular), he/she/it, we, and you (plural). Also who and they. A subjective pronoun serves as the subject in a sentence. For illustration, see the sentences below:
Example – I have a giant chocolate bar.
Example – You have some ice cream.
Example – He has a cupcake.
Example – We could have a party.
Example – They could come, too.
Example – Who would be invited?
Use Of Objective Pronouns
The objective (or accusative) case pronouns are you and me (singular), us, him/her/it, you (plural), them, and whom. (Notice that form of you and it doesn’t change.) The objective case is utilized when something is being given to or done to someone. The sentences below illustrate this use of the objective case:
Example – Give the chocolate to me, please.
Example – Why should I give it to you?
Example – You could give it to him, instead.
Example – Please share that with all of us.
Example – Do we need to share it with them?
Use Of Possessive Pronouns
There are two sorts of possessive pronouns. The first kind is used with nouns my and your (singular), his, her, your (plural), their, its, our. The other type of pronouns sometimes are called independent possessive pronouns because they can stand independently. They are mine, yours (singular), his, hers, ours, yours (plural), and theirs. These possessive pronouns indicate that something (or someone) belongs to someone (or something).
Example – That’s my coat.
Example – That coat is mine.
Example – The car is theirs.
Example – It’s their car.
Example – The cat is scratching its ear.