There is a group of nouns called N-Declination. You have to add "n" or "en" to the noun if you use it in Accusative, Dative or Genitive. In the next post you will find out which nouns are meant. #lernt_deutsch
Fun classroom activity for the genitive case. First student starts, following students have to repeat all of the elements (e.g. der Nagel des Fingers, der Nagel des Fingers der Hand, der Nagel des Fingers der Hand des Armes etc.). Complete worksheet: http://deutschdrang.com/dir/wp-content/uploads/2013/02/gendiagramro.doc
Do your students get frustrated with having to memorize the different article endings in German and ask why German cannot simply use a universal one-size-fits-all article like "the" or "a" for all cases? You might want to use this as a way to explain why article forms are important in German.
Useful for advanced students. Different forms of "Vorgangspassiv" vs. "Zustandspassiv". The "Vorgangspassiv" is most comparable to the English use of the continuous tense in the passive, whereas the "Zustandspassiv" is the end result, where the participle is usually perceived more as an adjective than as a participle. "Das Fenster wird geschlossen" (the window is being closed) vs. "Das Fenster ist geschlossen" (The window is closed).