Using Indefinite Pronouns - English Plus
www.englishplus.com/grammar/00000027.htmPlural: both, few, many, others, several Singular or Plural: all, any, more, most, none, some Singular indefinite pronouns take singular verbs or singular personal pronouns. Correct: Each of the members has one vote. (The subject, each, is singular. Use has.) Incorrect: One of the girls gave up their seat.