Board Thread:Linguistics/@comment-1595565-20150508010307/@comment-28303871-20150508015633

By "not already copyrighted by your friend," I meant any parts of the story he's writing that are in the language you're creating.

Grammar has no correlation with culture, so I'd advise against that. Although, if I may ask, if you weren't creating a grammar, what were you doing that he couldn't do himself?