Breakdown of Вас шестеро, пусть кто-нибудь поможет мне!
я
I
вы
you (plural)
помочь
to help (perfective)
кто-нибудь
anyone / someone (unspecified)
Questions & Answers about Вас шестеро, пусть кто-нибудь поможет мне!
Why is the pronoun вас in the Genitive case here instead of Nominative (вы)?
When expressing "there are [number] of us/you/them", Russian uses the Genitive case of the personal pronoun (нас, вас, их) acting as the subject, followed by a collective numeral (двое, трое, шестеро, etc.) acting as the predicate. So вас шестеро essentially means "of you, there is a group of six".
Could I say вас шесть instead of вас шестеро?
Grammatically, yes, but it sounds less natural. When stating the number of people in a group using a personal pronoun (мы, вы, они), Russian strongly prefers collective numerals (like двое, трое, четверо, up to десятеро) over regular cardinal numbers (like два, три, шесть).
Why use кто-нибудь instead of кто-то for "someone"?
Кто-то refers to a specific, but unknown person (e.g., "someone called"). Кто-нибудь means "anyone at all" and is heavily used in questions, requests, and future situations where the identity doesn't matter. Since the speaker just wants any one of the six people to help, кто-нибудь is the correct choice.
How does work with the verb here?