Questions & Answers about Я не хочу слезать с горы.
Why do we use с here instead of из for "from"?
The choice of "from" depends on the "to" preposition. Because you go onto a mountain (на гору), you must come off or from it using с (с горы). If a location uses в (into), you would use из (out of) to leave it instead.
Why is the imperfective verb слезать used here instead of the perfective слезть?
In Russian, negated verbs of desire like не хочу (I do not want to) almost always take an imperfective infinitive. This shows a complete rejection of the action itself, even if you are just talking about getting down from this specific mountain right now.
How does the prefix on слезать relate to the rest of the sentence?
The verb is built from лезть (to climb) plus the prefix с-, which means "down from" or "off". Russian verbs of motion often duplicate the meaning of their prefix by using the exact same preposition right after the verb, which is why we see слезать с.
What case is горы, and is it plural?
It is not plural here; it is the genitive singular form of гора (mountain). The preposition с meaning "from" or "off of" always forces the noun into the genitive case, changing the feminine ending -а to -ы.