Someone, something, nobody

valaki/valami ('someone/something') and mindenki/minden ('everyone/everything') behave like ordinary nouns — they can take -t for a direct object, -nak/-nek for 'to/for', and so on.

senki/semmi ('no one/nothing') look negative already, but Hungarian still needs nem before the verb: Nem látok senkit literally says 'I don't see nobody' — this double negative is required, correct Hungarian, not a mistake.