Final-weak roots contain a weak third radical; that underlying radical is not always obvious in the written past.
VerbRootPresentWith لَمْCommand
دَعَاد ع ويَدْعُولَمْ يَدْعُاُدْعُ
رَمَىر م ييَرْمِيلَمْ يَرْمِاِرْمِ
رَضِيَر ض ويَرْضَىلَمْ يَرْضَاِرْضَ
Jussive deletion removes the last weak radical in these singular stems, leaving a characteristic preceding vowel. رَضِيَ belongs to a wāw-final root despite its visible yāʾ in the past.
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Final-weak roots contain a weak third radical; that underlying radical is not always obvious in the written past.
VerbRootPresentWith لَمْCommand
دَعَاد ع ويَدْعُولَمْ يَدْعُاُدْعُ
رَمَىر م ييَرْمِيلَمْ يَرْمِاِرْمِ
رَضِيَر ض ويَرْضَىلَمْ يَرْضَاِرْضَ
Jussive deletion removes the last weak radical in these singular stems, leaving a characteristic preceding vowel. رَضِيَ belongs to a wāw-final root despite its visible yāʾ in the past.