Advanced Duolingo (for German)
Episode 9
Learn how to take simple Duolingo lessons to the next level by incorporating some grammar exercises to become more familiar with German sentence structure, case identification (Nominative, Dative, Accusative and Genitive). Cheat Sheet
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Disclaimer: I have any official language training, I am a student who wants to share some tips I used to help me advance my German language proficiency.