2.1  Origin of language

 

In the Biblical story of the Towel of Babel, all of humanity once spoke a single language until they split into many groups unable to understand each other. We don't really know if such an original language ever existed, but we do know that the thousand of languages existing today can be traced back to a much smaller number. So how did we end up with so many? The world was much less populated in the early days of human migration. The groups of people that shared a single language and culture often split into smaller tribes and were going separate ways in search of fertile land. As the smaller tribes migrated and settled in new places, they became isolated from one another and developed in different ways. Centuries of living in different conditions, eating different food and encountering different neighbours turned similar dialects with varied pronunciation and vocabulary into different languages, continuing to divide as populations grew and spread out further. 

A language will keep on evolving, just like it has in the past. That's why I think you should start with small steps, the basics of a language. You should also try to adapt yourself to the way you teach language.