The document discusses indefinite and definite pronouns. Indefinite pronouns refer to general, non-specific people, things, and places, while definite pronouns refer to specific people, things, and places. Examples are given of indefinite pronouns like "someone", "somebody", and "nobody" as well as definite pronouns like "Kathy" and "the train". Readers are asked to identify whether given indefinite pronouns refer to people, things, or places.