وَ«فِي الدَّارِ رَجُلٌ».
Translation: There is a man in the house.
فِي: preposition.
الدَّارِ: genitive noun.
فِي الدَّارِ: prepositional phrase serving as a fronted khabar, with an understood relational word such as “present.”
رَجُلٌ: delayed, nominative mubtadaʾ, indefinite.
The fronted locative predicate establishes the setting before introducing an unspecified person.