Überprüfe den Wasserstand. (informal) Überprüfen Sie den Wasserstand. (formal)
informal letter informal letter
informal
informal talk what is it
It's a wedding where the dress code is more relaxed.
informal
informal reseach
Eres informal
You should consider the expectations of the people to whom you are talking (or for whom you are writing), and also check your horoscope for the day and see if the astrological influences favor informal or formal English.
Our gathering will be informal.
informal organization definition
Informal Group in organization