The predicate verb may be described without naming its object, or its action may be specified through the object. Adding the object identifies who or what is affected by the action.
«زيد ضرب عمرا»
Zayd struck ʿAmr.
«عمرا» is not a decorative addition; it determines the participant affected by «ضرب». Omitting it might produce a broader assertion or leave the hearer asking whom Zayd struck.
Here qualification (taqyīd) does not mean only a conditional clause. It is any expression that limits or clarifies the intended verbal relation.