Rule 3: When the medial yāʾ of the simple-triliteral perfect is elided because of adjacent quiescent letters, the first radical receives kasrah.
بَيْعْنَ → بِعْنَ — the women sold.
بِعْتُ — I sold.
Contrast this with قَالَ → قُلْتُ. Kasrah is associated here with the yāʾ-hollow underlying structure; the difference is systematic, not simply a memorized pronunciation.
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Rule 3: Kasrah after Yāʾ Elision
Hollow Verbs: Seven Iʿlāl Rules and Three Short Paradigms
Rule 3: When the medial yāʾ of the simple-triliteral perfect is elided because of adjacent quiescent letters, the first radical receives kasrah.
بَيْعْنَ → بِعْنَ — the women sold.
بِعْتُ — I sold.
Contrast this with قَالَ → قُلْتُ. Kasrah is associated here with the yāʾ-hollow underlying structure; the difference is systematic, not simply a memorized pronunciation.