The primary use of your subjunctive I in German would be the indirect speech, these tenses are a lot less used in the German language. You could check with the lesson focused on using the subjunctive I in German. indicative ich hatte gekauft wir hatten gekauft subjunctive ich hätte gekauft https://youtubez.de/warum-sie-instagram-follower-kaufen-sollten-die-vorteile-einer-schnellen-steigerung-ihrer-fangemeinde/