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