Can someone explain to me why here the relative pronoun belongs to a different case? Because I don't see the difference between the two sentences ... (that's from an exercise in my German book)
Die Freunde, denen wir im Kino begegneten, waren sehr freundlich. (Plural / dative, right?)
"The friends that we met in the cinema were really nice."
Der Junge, den wir in den Ferien kennengelernt haben, spricht sehr gut Deutsch. (Masculine / accusative, right?)
"The boy that we met on holidays speaks good German."