Can someone please explain objective, subjective, and possessive pronouns? Thanks!

An objective pronoun acts as the object of a sentence—it receives the action of the verb. The objective pronouns are her, him, it, me, them, us, and you.

Subject pronouns are used to replace nouns that are the subject of the sentence. They can be first, second, or third person. They can also be singular or plural. The subject pronouns are: I, you, he, she, it, we, and they.

Possessive pronouns show that something belongs to someone. The possessive pronouns are my, our, your, his, her, its, and their. There's also an “independent” form of each of these pronouns: mine, ours, yours, his, hers, its, and theirs. Possessive pronouns are never spelled with apostrophes.