The chapter gives two ḍammah errors: inadequate rounding with some inkhifāḍ makes it kasrah-like; introducing infitāḥ may make it fatḥah-like.
Three-way practice: read «نَ، نِ، نُ» at the same pace. Keep the nūn consistent while clearly changing the short vowel.
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How ḍammah loses its identity
Correct Vowel Articulation — Fatḥah, Kasrah, Ḍammah, Ishbāʿ and Sukūn
The chapter gives two ḍammah errors: inadequate rounding with some inkhifāḍ makes it kasrah-like; introducing infitāḥ may make it fatḥah-like.
Three-way practice: read «نَ، نِ، نُ» at the same pace. Keep the nūn consistent while clearly changing the short vowel.