It’s natural, relational, holistic and practical, as well as realistic.
Some linguistic theory suggests the brain has pre-language structures. Given this, with children learning in the context of relationships - that is, family - relationship seems to be the most natural way, that is, conversational relationship. So that the natural correspondence between language and relationship makes learning easy as one is organically related to to the other.
Moreover, relationship makes for people to relax and grow, not just learn.
No, it is not.
Learning the basics should take about three weeks.
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