Pronouns can replace nouns and include personal, relative, indefinite, demonstrative, interrogative, and reflexive types. Personal pronouns represent people or things and vary by number, person, gender, and case. Relative pronouns relate subordinate clauses. Indefinite pronouns do not refer to specific things and include all, another, any. Demonstrative pronouns identify nouns like this and that. Interrogative pronouns ask questions like what and who. Reflexive pronouns end in -self and refer back to the subject.