تَعَلَّمَ ← تُعُلِّمَ
In Form V, with an extra initial tāʾ, both the first and second letters take ḍamma, while the penultimate stem vowel becomes kasra: taʿallama→tuʿullima.
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Forms Beginning with an Extra Tāʾ
The Passive Verb: Past, Imperfect, and Proxy Subject
تَعَلَّمَ ← تُعُلِّمَ
In Form V, with an extra initial tāʾ, both the first and second letters take ḍamma, while the penultimate stem vowel becomes kasra: taʿallama→tuʿullima.