Rule 4: A quiescent, non-doubled yāʾ preceded by ḍammah becomes wāw. It operates in the reverse direction from Rule 3.
مُيْقِنٌ → مُوقِنٌ — one who is certain.
The root is ي ق ن. In the active participle, mīm bears ḍammah and the following original yāʾ is quiescent, so yāʾ becomes wāw.
Although مُوقِنٌ visibly has wāw, its first radical is yāʾ.
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Rule 4: Quiescent Yāʾ After Ḍammah
Weak-Initial Roots: Elision, Substitution, Assimilation and Short Paradigms
Rule 4: A quiescent, non-doubled yāʾ preceded by ḍammah becomes wāw. It operates in the reverse direction from Rule 3.
مُيْقِنٌ → مُوقِنٌ — one who is certain.
The root is ي ق ن. In the active participle, mīm bears ḍammah and the following original yāʾ is quiescent, so yāʾ becomes wāw.
Although مُوقِنٌ visibly has wāw, its first radical is yāʾ.