Usages of formal
En esa empresa prefieren tutear a todo el mundo, incluso cuando el primer trato parece muy formal.
In that company they prefer to use tú with everyone, even when the first interaction seems very formal.
Prefiero un correo breve y formal cuando escribo a una profesora que no conozco.
I prefer a short and formal email when I write to a teacher I do not know.
Elon.io is an online learning platform
We have an entire course teaching Spanish grammar and vocabulary.