Rule 2 concerns how the position of an underlying final weak radical and its preceding vowel condition substitution in derived and inflected forms. The outcome depends on the pattern and neighboring vowel, not only on the dictionary root.
يَرْضَى — he is content; its final alif maqṣūrah is not proof of an underlying yāʾ root.
يُدْعَى — he/it is called; compare active يَدْعُو from the same root د ع و.
Different active and passive patterns can therefore display different endings even for the same root.
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Rule 2: Position and the Final Weak Letter
Defective Verbs: Six Iʿlāl Rules and Four Short Paradigms
Rule 2 concerns how the position of an underlying final weak radical and its preceding vowel condition substitution in derived and inflected forms. The outcome depends on the pattern and neighboring vowel, not only on the dictionary root.
يَرْضَى — he is content; its final alif maqṣūrah is not proof of an underlying yāʾ root.
يُدْعَى — he/it is called; compare active يَدْعُو from the same root د ع و.
Different active and passive patterns can therefore display different endings even for the same root.