German cases: start with the noun phrase's job
Nominative normally marks the subject, accusative the direct object, dative a recipient or indirect object, and genitive possession or relationship.
For masculine definite articles, watch der → den → dem → des: Der Mann schläft; Ich sehe den Mann; Ich gebe dem Mann das Buch; das Auto des Mannes.
Yesterday’s weil and verb-at-the-end lesson dealt with word order. Cases answer a different question: what grammatical role does each noun phrase play?
Quick check
What case is den Mann in Ich sehe den Mann?
See German grammar repeatedly in complete sentences.
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