All the German is mixed up regarding formal or familiar. It would help people who are learning to know how and when to use each approach with accordance to whom they are speaking. For example: when greeting someone you don't know, you would say "Wie geht es Ihnen?" But when speaking to a close friend or family member, you could say "Wie geht's du?" Or "Wie geht's?"
Also, there are some very basic differences in saying things more than one way, which often is different simply depending on what part of Germany a person is in. For example, in northern Germany, people tend to introduce themselves by saying "Mein Name ist..." whereas in Southern Germany, or Bavaria, people introduce themselves more commonly by saying "Ich heiße..."
This app should specify both place and rank when giving phrases to learn. Many Germans are quite forgiving to foreigners who try to speak their language, but if a young person would say to a doctor and stranger "Wie geht's?", s/he would most likely be quite offended.
I think this about covers the very basic problem with this app. Someone who knows no German or customs would have no clue at all what they are really learning. I would not recommend this app to anybody for learning purposes under any circumstances. I understand that this is not meant to be an in-depth learning app, but it could very easily be changed to stay simple and yet properly teach phrases just the same.
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