اِطَّهَرَ — يَطَّهَرُ — اِطَّهَارًا
Assimilation changes the visible spelling in this pattern. The initial alif of اِطَّهَرَ is hamzat al-waṣl; this is not the same as an assumed hamzat al-qaṭʿ pattern أَطْهَرَ.
اِطَّهِرْ — become pure!
لَا تَطَّهَرْ — do not become pure!
Here meaning, gemination and vocalisation must be kept together; unvowelled spelling alone is insufficient for a full morphological analysis.
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Assimilation and the ninth paradigm
Nine Augmented Triliteral Patterns with Hamzat al-Wasl
اِطَّهَرَ — يَطَّهَرُ — اِطَّهَارًا
Assimilation changes the visible spelling in this pattern. The initial alif of اِطَّهَرَ is hamzat al-waṣl; this is not the same as an assumed hamzat al-qaṭʿ pattern أَطْهَرَ.
اِطَّهِرْ — become pure!
لَا تَطَّهَرْ — do not become pure!
Here meaning, gemination and vocalisation must be kept together; unvowelled spelling alone is insufficient for a full morphological analysis.