The document discusses different categories of pronouns based on their use, including:
1. Demonstrative pronouns like this, that, these, those.
2. Indefinite pronouns like everybody, anybody, nobody, etc.
3. Interrogative pronouns like who, whom, whose, what, which, when, where, why, how.
4. Possessive pronouns like mine, hers, his, yours, ours, theirs.
The most common pronouns are he, she, you, they, it, we, she, them, him, her, me, who. Pronouns can also be categorized based on number (