Main ways an indefinite mubtadaʾ appears in these source examples:
1. Qualified by an adjective: «رَجُلٌ صَالِحٌ حَاضِرٌ».
2. Under interrogation: «أَرَجُلٌ فِي الدَّارِ؟».
3. Under negation: «مَا أَحَدٌ خَيْرٌ مِنْكَ».
4. After a fronted locative predicate: «فِي الدَّارِ رَجُلٌ».
5. In a greeting/supplication: «سَلَامٌ عَلَيْكَ».
These summarize examples relevant here, not an exhaustive list of all traditional licenses for indefinite subjects.
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Mubtadaʾ and Khabar — Definition and Foundational Rules
Main ways an indefinite mubtadaʾ appears in these source examples:
1. Qualified by an adjective: «رَجُلٌ صَالِحٌ حَاضِرٌ».
2. Under interrogation: «أَرَجُلٌ فِي الدَّارِ؟».
3. Under negation: «مَا أَحَدٌ خَيْرٌ مِنْكَ».
4. After a fronted locative predicate: «فِي الدَّارِ رَجُلٌ».
5. In a greeting/supplication: «سَلَامٌ عَلَيْكَ».
These summarize examples relevant here, not an exhaustive list of all traditional licenses for indefinite subjects.