I need some German help please?

Question

Can you please tell me if these words are genitive, accusative, or dative and explain to me why if you want:

während

bei

um

trotz

Answer 1

Während uses the genitive. There's really no explanation for it, it just does.

Bei uses the dative, because it indicates location.

Um uses the accusative.

Trotz uses the genitive, again there is no reason for it, it just does.

Answer 2

während takes genitive

bei takes dative

um takes accusative

trotz takes genitive

You just have remember which takes which

you should use this:

http://www.ielanguages.com/German2.html#...