Wortino

kündigen: haben or sein? Perfect tense: hat gekündigt

In English: to quit, terminate, give notice · A2

The answer

In the Perfekt, kündigen takes: haben

Perfekt auxiliary
haben
Partizip II
gekündigt
Perfekt
hat gekündigt

Wortino stores one auxiliary per verb; some verbs can take both depending on the meaning.

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