Rule 4 permits replacement of a hamzah bearing fatḥah when the preceding letter bears kasrah or ḍammah. The substitute matches the preceding vowel.
سُؤَالٌ → سُوَالٌ — sīn bears ḍammah, so substitution with wāw is permitted.
Here hamzah is moving and bears fatḥah. That differs from Rule 1, which required a quiescent hamzah.
The lighter form is explained through substitution; the standard underlying lexical form سُؤَالٌ remains relevant.
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Rule 4: Open Hamzah After Kasrah or Ḍammah
Rules of Hamzated Forms: Lightening, Substitution, Elision and Short Paradigms
Rule 4 permits replacement of a hamzah bearing fatḥah when the preceding letter bears kasrah or ḍammah. The substitute matches the preceding vowel.
سُؤَالٌ → سُوَالٌ — sīn bears ḍammah, so substitution with wāw is permitted.
Here hamzah is moving and bears fatḥah. That differs from Rule 1, which required a quiescent hamzah.
The lighter form is explained through substitution; the standard underlying lexical form سُؤَالٌ remains relevant.