Long answer - thank you.   But you are talking about addressing someone as ´you´ and the polite versus impolite way of doing so (and you are right there is no ´formal´ and ´informal´ ´you´ in English).  But I call my friends ´sen´ and they have never called me rude, impolite, childish or ignorant.   My question was why do you refer to yourself in the plural?  ´I´ or ´Ben´ is first person singular, ´We´ or ´Biz´ refers to more than one person.

 Is that not ..the benefits of yoghurt?

So not the same rule anyway.

Sorry but this is confusing me