Wortino

untergehen: haben or sein? Perfect tense: ist untergegangen

In English: to sink; to set (sun); to perish, be destroyed · A2

The answer

In the Perfekt, untergehen takes: sein

Perfekt auxiliary
sein
Partizip II
untergegangen
Perfekt
ist untergegangen

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

Perfekt example

Die Sonne ist untergegangen.

The sun has gone down.

Tatoeba · enteka · CC BY 2.0 FR
Der Mond ist untergegangen.

The moon has set.

Tatoeba · Pfirsichbaeumchen · CC BY 2.0 FR

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