أَيْقَنَ — يُوقِنُ — إِيقَانًا — مُوقِنٌ
These forms belong to root ي ق ن. The perfect أَيْقَنَ visibly retains yāʾ, whereas the imperfect and active participle show wāw.
In مُيْقِنٌ → مُوقِنٌ, the preceding ḍammah determines the substitution.
Consequently, a word's current spelling alone cannot always identify its underlying weak radical; the family of derived forms must also be considered.
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Relating أَيْقَنَ to مُوقِنٌ
Weak-Initial Roots: Elision, Substitution, Assimilation and Short Paradigms
أَيْقَنَ — يُوقِنُ — إِيقَانًا — مُوقِنٌ
These forms belong to root ي ق ن. The perfect أَيْقَنَ visibly retains yāʾ, whereas the imperfect and active participle show wāw.
In مُيْقِنٌ → مُوقِنٌ, the preceding ḍammah determines the substitution.
Consequently, a word's current spelling alone cannot always identify its underlying weak radical; the family of derived forms must also be considered.