عَلِمْتُ زَيْدًا عَالِمًا
Translation: I knew Zayd to be learned.
ʿAlimtu is the past verb with subject pronoun; Zaydan is object 1 and ʿāliman object 2. They were formerly a subject–predicate pair.
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After the Cognitive Verb Is Added
Verbs of the Heart: Two Objects, Cancellation and Suspension
عَلِمْتُ زَيْدًا عَالِمًا
Translation: I knew Zayd to be learned.
ʿAlimtu is the past verb with subject pronoun; Zaydan is object 1 and ʿāliman object 2. They were formerly a subject–predicate pair.