Indefinite pronouns can be tricky — knowing when to use someone vs. anyone, or something vs. nothing, depends on the type of sentence you're in. This is exercise 1 of 2, focusing on the core patterns for -one/-body, -thing, and -where compounds. Exercise 2 covers more complex uses.
Grammar reviewIndefinite pronouns
Indefinite pronouns refer to non-specific people, things, or places. They are formed from a prefix + suffix: