@nick_mmrdl Unfortunatetly there's no rule for that. You will have to memorize it. As someone else said. There's fewer neuter words. I would just stick to masculine and neuter( en and et.) I myself never use ei. A danish influence; they only have two genders. A lot of words can be both feminine and masculine depending on writing. En Bok - boken min (masculine) or Ei Bok - BokA mi (feminine), and Bestemoren min; Bestemora mi (my grandma). If I'm correct, then all words that can end on A" is feminine. If I were you, I would learn the neuter words, and then go with masculine for everything else. Except for Jente. Jenten min though correct just sounds weird to me.
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