This conjugation tense is usually accustomed to sort standard polite expressions in German. You could seek the advice of the lesson focused on the usage of the subjunctive II in German. The leading use of your subjunctive I in German is the indirect speech, these tenses are much less used https://geschaftmega.de/die-umweltfreundliche-revolution-warum-baumwolltaschen-die-nachhaltige-wahl-sind/