كَتَبَ الطَّالِبُ الدَّرْسَ — كُتِبَ الدَّرْسُ — الدَّرْسُ مَكْتُوبٌ
Kataba is active past; kutiba is passive past; maktūb is a noun (a passive participle) here functioning as predicate.
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Three Different Structures
Ism al-Mafʿūl: Formation, Weak Roots and Government
كَتَبَ الطَّالِبُ الدَّرْسَ — كُتِبَ الدَّرْسُ — الدَّرْسُ مَكْتُوبٌ
Kataba is active past; kutiba is passive past; maktūb is a noun (a passive participle) here functioning as predicate.