زَيْدٌ ضَارِبٌ غُلَامُهُ عَمْرًا — زَيْدٌ مَضْرُوبٌ غُلَامُهُ
In the active example ghulāmuhu is fāʿil and ʿAmran object. In the passive example ghulāmuhu is nāʾib fāʿil. Both are nominative, but for different reasons.
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Two Participles Side by Side
Ism al-Mafʿūl: Formation, Weak Roots and Government
زَيْدٌ ضَارِبٌ غُلَامُهُ عَمْرًا — زَيْدٌ مَضْرُوبٌ غُلَامُهُ
In the active example ghulāmuhu is fāʿil and ʿAmran object. In the passive example ghulāmuhu is nāʾib fāʿil. Both are nominative, but for different reasons.