فُتِحَ الْبَابَانِ — The two doors were opened.
فُتِحَ: singular masculine past passive.
الْبَابَانِ: dual passive subject, nominative by alif.
With a following overt dual in standard verb-initial Arabic, the verb remains singular. Do not add a second explicit dual subject to «فُتِحَا» here.
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Mafʿūl Mā Lam Yusamma Fāʿiluhu — The Passive Subject
فُتِحَ الْبَابَانِ — The two doors were opened.
فُتِحَ: singular masculine past passive.
الْبَابَانِ: dual passive subject, nominative by alif.
With a following overt dual in standard verb-initial Arabic, the verb remains singular. Do not add a second explicit dual subject to «فُتِحَا» here.