Questions & Answers about Annas hjelm er grønnere enn min.
Why is possession shown by Annas instead of using til Anna or Anna sin?
In Norwegian, you most often form the genitive with -s directly on the owner’s name (just like English). So Annas hjelm means “Anna’s helmet.” You can say hjelmen til Anna (“the helmet of Anna”) for emphasis or style, but Anna sin hjelm is non-standard in Bokmål (it’s more a dialect/vernacular feature).
Why isn’t there an article (like en or den) before hjelm?
Because Annas hjelm is already definite. The -s genitive ending makes the noun definite without needing den. If you said en hjelm (a helmet) or hjelmen (the helmet), those would need an article or a definite ending, but genitive absorbs that.
How does grønnere relate to grønn? Why not mer grønn?
Grønnere is the regular comparative of the adjective grønn (“green”). Short adjectives in Norwegian form the comparative with -ere (grønn → grønnere). You could say mer grønn when the adjective is long or borrowed (e.g. mer interessant), but not with short, native adjectives like grønn.
What is the function of enn in this sentence?