The chapter brings together many kinds of qualification, but their functions should remain distinct.
ExpressionExtra information
كَتَبَ زَيْدٌ رِسَالَةًObject: what was written
كَتَبَ زَيْدٌ لَيْلًاTime adjunct: when it happened
جَاءَ زَيْدٌ مُسْرِعًاCircumstance: how he arrived
أُكْرِمُكَ إِنْ تُكْرِمْنِيCondition: dependence on another event
The governing standard is fitness to the situation. A qualifier may be indispensable in one context and irrelevant in another.