الْبَابُ فُتِحَ
Al-bābu is a fronted topic, not a postverbal nāʾib al-fāʿil. The passive verb contains an understood proxy-subject pronoun referring back to al-bāb.
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Topic versus Postverbal Proxy Subject
The Passive Verb: Past, Imperfect, and Proxy Subject
الْبَابُ فُتِحَ
Al-bābu is a fronted topic, not a postverbal nāʾib al-fāʿil. The passive verb contains an understood proxy-subject pronoun referring back to al-bāb.