In all five pairs listed here, the middle radical has ḍammah in both forms:
● Past: فَعُلَ
● Present: يَفْعُلُ
Examples: قَرُبَ—يَقْرُبُ and ضَعُفَ—يَضْعُفُ.
This observation is limited to these five listed pairs; it is not a universal claim about every Arabic verb.
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Fa'ula Verbs and Cumulative Present-Tense Practice
In all five pairs listed here, the middle radical has ḍammah in both forms:
● Past: فَعُلَ
● Present: يَفْعُلُ
Examples: قَرُبَ—يَقْرُبُ and ضَعُفَ—يَضْعُفُ.
This observation is limited to these five listed pairs; it is not a universal claim about every Arabic verb.