Rule 1: In the relevant environment, an underlying final wāw after kasrah changes to yāʾ. This harmonizes the weak consonant with the preceding kasrah.
رَضِوَ → رَضِيَ — he was content. رَضِوَ is a reconstructed explanatory form; the actual perfect is رَضِيَ.
The condition includes the preceding kasrah, not merely the presence of wāw at the end. That is why the surface ending of رَضِيَ should not be used as sole evidence for a yāʾ-final root.
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Rule 1: Final Wāw Changes to Yāʾ
Defective Verbs: Six Iʿlāl Rules and Four Short Paradigms
Rule 1: In the relevant environment, an underlying final wāw after kasrah changes to yāʾ. This harmonizes the weak consonant with the preceding kasrah.
رَضِوَ → رَضِيَ — he was content. رَضِوَ is a reconstructed explanatory form; the actual perfect is رَضِيَ.
The condition includes the preceding kasrah, not merely the presence of wāw at the end. That is why the surface ending of رَضِيَ should not be used as sole evidence for a yāʾ-final root.