Al-bābu maftūḥun qufluhu: maftūḥun is a passive participle serving as the predicate. Qufluhu is its nominative passive subject, not an accusative object.
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Passive Participle and its Dependent
Choosing the Correct Parsing: Meaning, Governance and Context
Al-bābu maftūḥun qufluhu: maftūḥun is a passive participle serving as the predicate. Qufluhu is its nominative passive subject, not an accusative object.