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# Chapter 23 - What happened?

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An old friend on the telephone.

Grammar unit: The perfect tense of separable verbs

Season 0 / Episode 25 Sep 2007 English Germany Health & Fitness

Problems with the boss.Grammar unit: The prefix un- and the suffix -in

Season 1 / Episode 4 12 min

An old friend on the telephone.Grammar unit: The perfect tense of separable verbs

Season 1 / Episode 23 12 min

A conversation about Aachen’s secrets.Grammar unit: The dative case (I)

Season 1 / Episode 18 12 min

Confusion at the reception desk.Grammar unit: the particle denn

Season 1 / Episode 21 12 min

Visiting Dr. Thürmann in the hospital.Grammar unit: The perfect tense of inseparable verbs

Season 1 / Episode 24 12 min

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