فُتِحَ الْبَابَانِ
The postverbal dual proxy subject uses alif for the nominative. The preceding finite verb normally stays singular.
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Dual Proxy Subject
The Passive Verb: Past, Imperfect, and Proxy Subject
فُتِحَ الْبَابَانِ
The postverbal dual proxy subject uses alif for the nominative. The preceding finite verb normally stays singular.