وَاعْلَمْ: أَنَّ النَّكِرَةَ تُوصَفُ بِالْجُمْلَةِ الْخَبَرِيَّةِ، نَحْوُ: «مَرَرْتُ بِرَجُلٍ أَبُوهُ عَالِمٌ» أَوْ «قَامَ أَبُوهُ».
Translation: Know that an indefinite noun may be described by a declarative sentence, such as “I passed by a man whose father is learned” or “whose father stood up.”
A declarative clause can be nominal or verbal. As an adjective of an indefinite noun, the entire clause occupies the syntactic position of a naʿt.