"They are men."
Translation:Они - мужчины.
This is a big question: мужчины is the nominative plural of мужчина. I tried to find the Genitive of мужчина online, and the only thing I could find was мужчины (Singular) and мужчин (Plural), which are both feminine endings. In nominative, "my man" is мой мужчинa - a masculine possessive pronoun followed by a word with a feminine ending. (I think.)
My question: What is the genitive for "my man"? Do you continue to use Feminine endings with masculine possessive pronouns or determiners (like этот) in all declensions of "man? In other words, is Genitive "my man" моего мужчини - the Genitive Masculine Singular Possessive Pronoun "my" with "man" ending in the Genitive Female Singular?
Also: It impossible to say with certainty what a masculine ending would be for мужчина in any declension, because there's no "a" ending in the masculine declension table which can be used as a look-up starting point. (There are a's in the table - they just are not good look-up reference points.)