Futiḥa al-bābu ṣabāḥan: the passive verb comes first, al-bābu is nominative passive subject, and ṣabāḥan is an accusative time adverb.
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Case 7: Word Order and Passive Subjects
Advanced Parsing Workshop: Integrated Grammar
Futiḥa al-bābu ṣabāḥan: the passive verb comes first, al-bābu is nominative passive subject, and ṣabāḥan is an accusative time adverb.