Gerunds are the nominal forms (noun forms) of verbs, that is, verb forms in -ing used as nouns. Present (and past) participles are adjectival forms of verbs. The present participles are verb forms in -ing used as adjectives. So an -ing word used

If the genitive exists as a case in English, then it's the case assigned to a noun phrase by a possessive "-'s" that follows it. (I.e., in "the queen's museum", "the queen" would be genitive.) You begin