man = "one / you / people" in general, with the verb in the 3rd person singular. Accusative einen, dative einem, and you keep repeating man (never er). Don't mix up man and der Mann.
jemand and niemand: Akk. jemanden, Dat. jemandem (often without ending in speech). On its own, ein / kein takes the endings of dieser: Hast du einen Stift? Ja, ich habe einen.
Es gibt hier keinen Supermarkt.
There's no supermarket here.
Hier darf man nicht rauchen.
You're not allowed to smoke here.
Hast du jemanden gesehen? Nein, niemanden.
Did you see anyone? No, nobody.
Translate the words from your reading, review them as flashcards and practise with gap-fill sentences.
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