In every pair listed in this group:
● The middle radical of the past has kasrah: فَعِلَ.
● The middle radical of the listed present has fatḥah: يَفْعَلُ.
Examples: فَرِحَ—يَفْرَحُ and سَمِعَ—يَسْمَعُ.
This observation is limited to the 15 listed pairs here. It is not being stated as a universal rule for every Arabic verb on فَعِلَ.
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Fa'ila Verbs: The Complete Group
In every pair listed in this group:
● The middle radical of the past has kasrah: فَعِلَ.
● The middle radical of the listed present has fatḥah: يَفْعَلُ.
Examples: فَرِحَ—يَفْرَحُ and سَمِعَ—يَسْمَعُ.
This observation is limited to the 15 listed pairs here. It is not being stated as a universal rule for every Arabic verb on فَعِلَ.