How the knowledge of two or more languages in used by the same speaker in bilingual interaction (Code-Switching, Code-Mixing) The world which is full of languages. approximately 5-6 thousands. always found people who wanted to know more than their own native language. lt is calculated that every two weeks 1 language disappears. which means that over 400 languages have been vanished from the world's populations' tongue. To survive languages needs to be used over century with active usage. Languages die with the last carrier and therefore at risk, above all, a population which do not use the script. One of the causes of death of languages is the uneven spreading of the number of carriers...