Past tense is used to “locate” events that you’re talking about in the past. Most languages have multiple options and grades of past. German is among the easier ones because it’s not very precise, and rather easy to build.
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A fun overview over how the past tense works in German and where the differences are to English.
All about the perfect in German, also called spoken past - when to use it, how to form the past participle, aka ge-form and when to use "sein" and "haben".