Through the centuries, always it existed variation and change under the fono-ortogrficos and morfossemnticos aspects that had contributed for history of the language and will continue contributing stop transformation and addition of the lexicon of a language. In this exactly felt Bagno Landmarks (2003)? in one of its ten splits in the book Lingustico Preconception what it is, as become -, declares the idea of: To acquire knowledge itself that all dumb language and varies. What today it is seen as ' ' certo' ' already he was ' ' erro' ' in the past. What today ' is considered; ' erro' ' it can perfectly come to be considered as ' ' certo' ' in the future of the language. An example: in the medieval Portuguese a verb existed to leixar (that it even appears in the letter of Pero Vaz de Caminha to king D. Manuel I). With the time, this verb was being sharp to leave because d and l are make look like consonants, what it allowed the exchange of one for the other.
… Therefore is good for preventing to classify some grammatical phenomenon of ' ' erro' ': it can be, in the truth, an indication of what it will be the language in the future. It is evident that this level of understanding must be conquered by all the users of the language, whichever its social condition and escolaridade, in meanwhile one expects that beyond this understanding, it has the perfectioning of the formal writing, therefore all need to be proficient in the communication that permeia the work market, the administrative areas, judicial, academics, pertaining to school, being in the sending or the act of receiving of information, contrary case will have one consequent exclusion since the norm standard is instrument of being able and transformation in a society. Many times, the writing is neglected.