Breakdown of Есть ли среди вас желающие?
вы
you (plural or formal)
есть
is, there is, to have
ли
whether / if (in indirect questions)
среди
among
Questions & Answers about Есть ли среди вас желающие?
How does the word желающие function in this sentence?
It acts as a substantivized participle, which is simply a participle doing the job of a noun. It is the present active participle of the verb желать (to wish). While it literally translates to "the wishing ones," it is the standard Russian term for "volunteers" or "interested people."
Why is желающие in the nominative case rather than the genitive?
In Russian, questions about existence using Есть keep the subject in the nominative case. You only switch to the genitive case to express absence or non-existence, such as if you were stating that there are no interested people (Нет желающих).
Why does the question particle ли come right after Есть?
Which case is used for the pronoun вас here?
It is in the genitive case because the preposition среди (among) always requires the genitive case.