In ELT classrooms we talk about the “model language”. Sometimes this is used interchangeably with “native” or “authentic” language.
Native = mother tongue / used from birth or early childhood
Authentic = produced by natives for natives
“Model language” is the theory behind drilling, when we give someone the correct pronunciation and speech intonation. We want learners to listen to a good model. We, as native speakers, provide that model. So the “model language” is good.
The model, however, should not be confused with the goal. While the model language is the ‘good’ and ‘proper’ form, it should not be the goal. The goal is fluency and comprehensibility. A learner needs to be able to speak (and be understood) by a native. This is different from being able to speak like a native.
Take home lesson: Provide a good model for learners, but don’t require them to mimic you exactly.
Life in Vietnam 