OK, what I wanted to say... Ih English there is only one form of Imperative for all cases of life (Open!). In Russian there are two forms: singular (открой!), and plural (откройте!) when you speak with several men or with one older or not well-familiar man. In Spanish the situation is more difficilt, in this language there are even four forms: 1) tu: ¡abre! (for one friend), 2)vosotros ¡abrid! (several friends), 3)Vd: ¡abra! (older), and 4) Vds: ¡abran! (several non-friends).
Question: what the situation with Imperative is in other languages?