فَتَحَ خَالِدٌ الْبَابَ ← فُتِحَ الْبَابُ
Active: Khālid opened the door; Khālid is the subject and al-bāba the object. Passive: Futiḥa al-bābu; the subject is unmentioned, and the former object becomes nominative.
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Active versus Passive
The Passive Verb: Past, Imperfect, and Proxy Subject
فَتَحَ خَالِدٌ الْبَابَ ← فُتِحَ الْبَابُ
Active: Khālid opened the door; Khālid is the subject and al-bāba the object. Passive: Futiḥa al-bābu; the subject is unmentioned, and the former object becomes nominative.