خَالِدٌ مَفْتُوحٌ بَابُهُ.
Khālid is the topic; maftūḥ is the predicate and passive participle; bābuhu is its visible nominative passive subject. The door—not Khālid—is open.
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A Visible Passive Subject
Ism al-Mafʿūl: Formation, Weak Roots and Government
خَالِدٌ مَفْتُوحٌ بَابُهُ.
Khālid is the topic; maftūḥ is the predicate and passive participle; bābuhu is its visible nominative passive subject. The door—not Khālid—is open.