Al-bābu futiḥa starts with a nominative nominal subject (mubtada). The passive verb has an implicit passive subject, and its clause is the predicate. Compare futiḥa al-bābu with an overt passive subject.
Opening interactive controls...
Passive Verb After a Mubtada
Choosing the Correct Parsing: Meaning, Governance and Context
Al-bābu futiḥa starts with a nominative nominal subject (mubtada). The passive verb has an implicit passive subject, and its clause is the predicate. Compare futiḥa al-bābu with an overt passive subject.