so the masculine inanimate noun is different because it is in the genitive case? I know that it would be the same if it were accusative.
singular masculine inanimate nouns have genitive different from accusative. (it's usually unique form)(
neuter , and feminine nouns also have singular genitive different form singular accusative or nominative, but it often can be singular genitive=plural nominative=plural accusative.
Are months and days of the week capitalized in proper Polish grammar? In English, I was always taught to capitalize the name of a month, such as December.