نَحْوُ «كَمْ ضَرْبَةً ضَرَبْتَ» وَ«كَمْ ضَرْبَةٍ ضَرَبْتَ» مَصْدَرًا.
Translation: For example, “How many blows did you strike?” or “How many blows you struck!”; in both cases the counted item is an occurrence of the action.
For teaching, the two uses are distinguished by vocalization: interrogative «ضَرْبَةً», declarative «ضَرْبَةٍ». Kam occupies an accusative cognate-object position and ḍarbah specifies the unit counted.