This verb 開く represents a transitivity conjugation pair: to open (by itself) [Intransitive] (JLPT N5). 開く (aku) is intransitive (自動詞) and is used with が to describe something opening.
Context Example
デパートのドアが[開く]。
Depaato no doa ga aku.
The department store door opens. (Intransitive)
What is the transitive/intransitive verb for "to open (by itself) [Intransitive]"?
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