وَهُوَ كُلُّ مَفْعُولٍ حُذِفَ فَاعِلُهُ، وَأُقِيمَ هُوَ مَقَامَهُ، نَحْوُ: «ضُرِبَ زَيْدٌ».
Translation: It is an object whose agent is omitted and which is placed in the agent’s position, as in “Zayd was struck.”
Two operations occur: (1) the original subject/agent is omitted; (2) the former object is promoted to the grammatical position of subject. Zayd undergoes the action semantically yet is nominative.
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Mafʿūl Mā Lam Yusamma Fāʿiluhu — The Passive Subject
وَهُوَ كُلُّ مَفْعُولٍ حُذِفَ فَاعِلُهُ، وَأُقِيمَ هُوَ مَقَامَهُ، نَحْوُ: «ضُرِبَ زَيْدٌ».
Translation: It is an object whose agent is omitted and which is placed in the agent’s position, as in “Zayd was struck.”
Two operations occur: (1) the original subject/agent is omitted; (2) the former object is promoted to the grammatical position of subject. Zayd undergoes the action semantically yet is nominative.