عَلَّمَ — يُعَلِّمُ — مُعَلِّمٌ؛ عُلِّمَ — يُعَلَّمُ — مُعَلَّمٌ
Muʿallim is the teacher; muʿallam is the one taught. Retain shadda in both forms.
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Form II: Shadda and Vowel
Ism al-Mafʿūl: Formation, Weak Roots and Government
عَلَّمَ — يُعَلِّمُ — مُعَلِّمٌ؛ عُلِّمَ — يُعَلَّمُ — مُعَلَّمٌ
Muʿallim is the teacher; muʿallam is the one taught. Retain shadda in both forms.