وَعَدَ → يَوْعِدُ → يَعِدُ
1. The root is و ع د, making initial wāw a radical.
2. The underlying imperfect of this faʿala–yafʿilu verb is represented as يَوْعِدُ: yāʾ has fatḥah, wāw is quiescent, and ʿayn has kasrah.
3. Rule 1 drops the intervening wāw, yielding يَعِدُ.
Only two radicals are visible in this form, but the underlying verb is still triliteral.
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Deriving يَعِدُ from وَعَدَ
Weak-Initial Roots: Elision, Substitution, Assimilation and Short Paradigms
وَعَدَ → يَوْعِدُ → يَعِدُ
1. The root is و ع د, making initial wāw a radical.
2. The underlying imperfect of this faʿala–yafʿilu verb is represented as يَوْعِدُ: yāʾ has fatḥah, wāw is quiescent, and ʿayn has kasrah.
3. Rule 1 drops the intervening wāw, yielding يَعِدُ.
Only two radicals are visible in this form, but the underlying verb is still triliteral.