Give each student a card (or 2 depending on the size of the group). The first student starts by reading the German phrase on their card. Someone else in the room has the translation and calls it out. They then read the German phrase on their card and this continues until all the cards are called and you reach the student who started. You can play it the other way round and do English-German translations. You can time the class and see if they can beat their time next lesson or at the end of the lesson.