The door has its lock open. Al-bābu is mubtada, maftūḥun the passive-participle predicate, and qufluhu the nominative passive subject governed by the participle; -hu refers to the door.
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Case 6: Passive Participle and Its Subject
Advanced Parsing Workshop: Integrated Grammar
The door has its lock open. Al-bābu is mubtada, maftūḥun the passive-participle predicate, and qufluhu the nominative passive subject governed by the participle; -hu refers to the door.