Citation:
Indefinite pronouns are pronouns that refer to non-specific persons or things. They can represent quantities or general groups and are used when the identity of the noun is unknown or not important. Indefinite pronouns include words like 'someone', 'anyone', 'everyone', 'something', 'anything', and 'everything', which play a crucial role in subject-verb agreement, as their singular or plural nature directly affects the verbs that accompany them.