I study German. I don't know when to write dein or deine. For example: Dein Buch and Deine Sporttasche.

  • Hi and welcome to German Language Stack Exchange. Feel free to take a tour of the site. Visit the help center to learn more about how it works. Your question boils down to ‘how do I recognise a noun’s gender?’
    – Jan
    Commented Sep 22, 2016 at 20:52

1 Answer 1


Dein is a Possesivartikel. It depends on what you are talking about.

For the case Nominativ (what you're talking about) there are the following rules:

  • Maskulinum (der) -> dein
  • Femininum (die) -> deine
  • Neutrum (das) -> dein
  • Plural (die) -> deine

So regarding your examples:

Das Buch (Neutrum) -> Dein Buch

Die Sporttasche (Femininum) -> Deine Sporttasche

  • From Duolingo Mein Bruder liebt deinen Opa. Why deinen is used here? It should be dein or deine (respectfully)
    – paul
    Commented Jun 14, 2023 at 19:18