فَاسْمُ «كَانَ» هُوَ الْمُسْنَدُ إِلَيْهِ بَعْدَ دُخُولِهَا، نَحْوُ: «كَانَ زَيْدٌ قَائِمًا».
Translation: The ism of kāna is the entity about which information is predicated after kāna enters; for example: Zayd was standing.
The musnad ilayh is what the statement is about: «قَائِمًا» is predicated of «زَيْدٌ». Hence Zayd is ism kāna, not an ordinary fāʿil or direct object.
Opening interactive controls...
The Ism of Kāna and Its Sisters
فَاسْمُ «كَانَ» هُوَ الْمُسْنَدُ إِلَيْهِ بَعْدَ دُخُولِهَا، نَحْوُ: «كَانَ زَيْدٌ قَائِمًا».
Translation: The ism of kāna is the entity about which information is predicated after kāna enters; for example: Zayd was standing.
The musnad ilayh is what the statement is about: «قَائِمًا» is predicated of «زَيْدٌ». Hence Zayd is ism kāna, not an ordinary fāʿil or direct object.