1. حَضَرَ أَحَدَ عَشَرَ رَجُلًا — the numeral is in the nominative position, both parts fixed.
2. حَضَرَ اثْنَا عَشَرَ رَجُلًا — «اثنا» is nominative with alif, «عَشَرَ» fixed.
3. حَضَرَ بَعْلَبَكُّ — «بَعْلَ» fixed and «بَكُّ» nominative with ḍammah.
All three act as subjects, yet their endings behave differently because the internal construction of each compound differs.