Becker provides us with a powerful description of language acquisition: “One learns these texts in action, by repetitions and corrections, starting with the simplest utterances of a baby. One learns to reshape these texts to new context, by imitation and by trial and error. One learns to interact with more and more people, in a greater and greater variety of environments.” (Becker, 1995, 144).
Grammar, therefore, is a set of rules not imposed on the speaker by books, but acquired as the structures of spoken, heard, and talked language.
The language is an intricately, infinitely complex system of clichés. To be understood, one has to rely on what has been already said billion times. There is a certain space for novelty but it is a regulated space.
Becker, Alton. Beyond Translation. 1995