Pronouns constitute a rather small lexical class, but they can also be the most confusing. That’s because as a pronoun can take so many forms. They exist in the first, second, and third person, and are further classified into nominative, oblique, reflexive, possessive determiners, and possessive pronouns. If you can believe it, they can be broken down even further than that. But for the purposes of keeping grammar 101 simple, let’s stick to those essential categories, written in the same order as above.