German has two main past tenses: Perfect tense and imperfect tense. The imperfect has also the name preterite. In A1 you will learn only a bunch of verbs in imperfect. The first ones are “haben” and “sein”.
Hatte
Ich hatte Du hattest Er/Sie/Es hatte Wir hatten Ihr hattet Sie hatten
War
Ich war Du warst Er/Sie/Es war Wir waren Ihr wart Sie waren
You can now say many great things in the past. The word positions stay the same.
Examples: Hattest du gestern Spaß? Did you have fun yesterday? Ich war krank. I was sick. Stefan und Marie hatten Urlaub. Stefan and Marie had vacation.
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Time adverbs
The following adverbs will make your sentences more natural (not only in past, but also in present tense statements).
nie/niemals — never selten — rarely manchmal — sometimes häufig/oft — often immer — always
Example dialogue: A: Warst du schon mal in New York? Have you ever been in New York? B: Nein, ich war noch nie in New York. No, I never have been in New York.