The source explanations can be organized around one root:
رَمَى: the final root yāʾ becomes alif in the appropriate perfect environment.
يَرْمِي: yāʾ remains; the indicative ḍamma is estimated rather than pronounced on the weak ending.
يُرْمَى: in the passive imperfect the final yāʾ becomes alif after the preceding fatḥah.
These are transformations of ر م ي, not three unrelated roots. Analyse pattern and vowels before describing a weak-letter change.
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Morphological Explanation of رَمَى and يَرْمِي
Full Conjugation of the Yāʾ-Final Verb رَمَى يَرْمِي
The source explanations can be organized around one root:
رَمَى: the final root yāʾ becomes alif in the appropriate perfect environment.
يَرْمِي: yāʾ remains; the indicative ḍamma is estimated rather than pronounced on the weak ending.
يُرْمَى: in the passive imperfect the final yāʾ becomes alif after the preceding fatḥah.
These are transformations of ر م ي, not three unrelated roots. Analyse pattern and vowels before describing a weak-letter change.