Form IV begins with hamzat al-qaṭʿ. A regular strong-root model is أَفْعَلَ يُفْعِلُ إِفْعَالًا, but the middle weak consonant changes the observable pattern in hollow verbs.
أَقَامَ — يُقِيمُ — إِقَامَةٌ
أَطَارَ — يُطِيرُ — إِطَارَةٌ
Both perfect stems show a medial alif, although the first root is wāw-based and the second is yāʾ-based. The final tāʾ marbūṭah in these verbal nouns belongs to these particular weak-derived formations, not to every Form-IV verbal noun.
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Form IV and the Initial Hamzah
Derived Hollow Wāw and Yāʾ Verbs: Short Paradigms and Morphological Reasoning
Form IV begins with hamzat al-qaṭʿ. A regular strong-root model is أَفْعَلَ يُفْعِلُ إِفْعَالًا, but the middle weak consonant changes the observable pattern in hollow verbs.
أَقَامَ — يُقِيمُ — إِقَامَةٌ
أَطَارَ — يُطِيرُ — إِطَارَةٌ
Both perfect stems show a medial alif, although the first root is wāw-based and the second is yāʾ-based. The final tāʾ marbūṭah in these verbal nouns belongs to these particular weak-derived formations, not to every Form-IV verbal noun.