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Answer:
Confusion with the month/day, and he/she can miss important days/events.
Explanation:
People visiting a German-speaking country without being aware of the numerical format for writing dates would probably make mistakes on a document for example, and maybe mistake the month, and the day, which could cause him to be late/early for a possible appointment made by the individual.
Answer:
well first i will tell you it is much easier to write in simple past for beginners in german not preterit. i know because ich wohne in deutschland. so try to us the GE form it works better for people learning german. unless your teacher wants preterit.