Emphasis: confirms the occurrence — «ضَرَبْتُ ضَرْبًا».
Kind: specifies what sort of action — «جَلَسْتُ جَلْسَةَ الْقَارِي».
Number: counts occurrences — «جَلَسْتُ جَلْسَتَيْنِ».
The syntactic function is related, but the semantic contribution differs.
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The Accusatives: Al-Mafʿūl al-Muṭlaq
Emphasis: confirms the occurrence — «ضَرَبْتُ ضَرْبًا».
Kind: specifies what sort of action — «جَلَسْتُ جَلْسَةَ الْقَارِي».
Number: counts occurrences — «جَلَسْتُ جَلْسَتَيْنِ».
The syntactic function is related, but the semantic contribution differs.