إِنَّ زَيْدًا فِي الدَّارِ
Translation: Indeed, Zayd is in the house.
زَيْدًا: accusative ism inna.
فِي: preposition; الدَّارِ: genitive object of the preposition.
فِي الدَّارِ: quasi-clausal predicative phrase, attached to an understood predicate such as «مُسْتَقِرٌّ».
The genitive noun after a preposition does not alter the accusative case of the ism inna.
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The Predicate of Inna and Its Sisters
إِنَّ زَيْدًا فِي الدَّارِ
Translation: Indeed, Zayd is in the house.
زَيْدًا: accusative ism inna.
فِي: preposition; الدَّارِ: genitive object of the preposition.
فِي الدَّارِ: quasi-clausal predicative phrase, attached to an understood predicate such as «مُسْتَقِرٌّ».
The genitive noun after a preposition does not alter the accusative case of the ism inna.