This conjugation tense can also be used to kind typical well mannered expressions in German. You could consult the lesson dedicated to using the subjunctive II in German. The main use from the subjunctive I in German is the indirect speech, these tenses are less Employed in the German language. https://geschaftmega.de/die-umweltfreundliche-revolution-warum-baumwolltaschen-die-nachhaltige-wahl-sind/