Source rule: an augmented/non-triliteral perfect verb does not yield a directly formed regular أَفْعَلُ comparative by the simple Form-I rule. For example, أَكْرَمَ belongs to augmented Form IV; copying all of its additional letters into afʿal is not valid direct formation.
To express a corresponding comparative meaning, Arabic commonly uses forms such as “أَكْثَرُ” or “أَشَدُّ” together with a verbal noun or appropriate phrase, e.g. “أَكْثَرُ إِكْرَامًا” (“showing more generosity/honour”).
This last illustration clarifies the book's basic restriction rather than quoting a further sentence from it.
Opening interactive controls...
Limits of direct formation
Ism al-Tafḍīl: Meaning, Eight Forms, Patterns and Use
Source rule: an augmented/non-triliteral perfect verb does not yield a directly formed regular أَفْعَلُ comparative by the simple Form-I rule. For example, أَكْرَمَ belongs to augmented Form IV; copying all of its additional letters into afʿal is not valid direct formation.
To express a corresponding comparative meaning, Arabic commonly uses forms such as “أَكْثَرُ” or “أَشَدُّ” together with a verbal noun or appropriate phrase, e.g. “أَكْثَرُ إِكْرَامًا” (“showing more generosity/honour”).
This last illustration clarifies the book's basic restriction rather than quoting a further sentence from it.