Recognize the correct German grammar case!
Ich helfe dem Vater. (I'm helping the father. - Who do I help? The father)
Dative
Er macht den Kaffee für uns. (He makes the coffee for us. - What does he make for us? The coffe.)
Accusativ
Der Hund bellt. (The dog barks. - Who barks? The dog.)
Nominative
Wir kommen müde aus dem Schwimmbad. (We come tired from the pool. - Where do we come from tired? The pool.)
Dative
Das ist der Ballon des kleinen Mädchens. (This is the balloon of the little girl. - Whos balloon is this? The little girls.)
Genititve
Wir mögen den Lehrer gar nicht. (We do not like the teacher at all. - Who don't we like? The teacher.)
Accusative
Das ist unser Geheimnis. (That is our secret. - Whos secret is it? Ours.)
Genititve
Die Kirche steht hier schon seit Jahrhunderten. (The church stands here since centuries. - What stands here since centuries? The church.)
Nominative