Qad does not govern the case or mood of the verb. Kataba remains a past verb built on fatḥ, while yaktubu is an indicative imperfect.
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Qad Does Not Change Case or Mood
Qad: Expectation, Confirmation and Contextual Meanings
Qad does not govern the case or mood of the verb. Kataba remains a past verb built on fatḥ, while yaktubu is an indicative imperfect.