Few years ago I was traveling High Atlas mountains in Morocco and happen to spend week or so hanging out in Berber village and became friendly with interesting bunch of local people that meet every evening to talk in their local dialect.

Interestingly most of original language is now gone and consist of many Arabic words. I was very surprised that most common words (say Tuesday if my memory serve me right) were lost first, but many more complex words not. Also traditional script is now gone and was replaced with modern made up script.