إِنَّ الطَّالِبَيْنِ نَاجِحَانِ
Translation: Indeed, the two students have succeeded.
«الطَّالِبَيْنِ»: accusative ism inna by yāʾ, because it is dual. «نَاجِحَانِ»: nominative khabar inna by alif, because it is dual.
The general nominative/accusative role remains; the visible case marker depends on noun class.