When we are young, we learn our first language without much effort and quite quickly: towards the end of early childhood, children have a linguistic competence similar to that of an adult. That is, at 6 years old chil… Learn more.

Let the teacher raise his hand who, after asking one of his students for an explanation of a problem or an argument in an oral presentation in class, has not ever heard this answer: "In plan ... I just don't know how … Learn more.