هُوَ فِعْلٌ حُذِفَ فَاعِلُهُ وَأُقِيمَ الْمَفْعُولُ مَقَامَهُ
Translation: It is a verb whose agent is omitted and whose object takes its place.
Futiḥa al-bābu: The door was opened. The doer is unmentioned; “the door” is the substitute subject.
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Source Definition
The Passive Verb: Past, Imperfect, and Proxy Subject
هُوَ فِعْلٌ حُذِفَ فَاعِلُهُ وَأُقِيمَ الْمَفْعُولُ مَقَامَهُ
Translation: It is a verb whose agent is omitted and whose object takes its place.
Futiḥa al-bābu: The door was opened. The doer is unmentioned; “the door” is the substitute subject.