For double fatḥah, the book gives a different ordinary stopping treatment: the tanwīn nūn is replaced by the sound of an alif. Thus بَصِيرًا at a stop ends with an extended fatḥah, like «بَصِيرَا».
Contrast the two modes: liaison has the audible tanwīn nūn; stopping uses the alif substitution in this form. Written form and specific exceptions still matter.
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Stopping on tanwīn fatḥ: substitution by alif
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
For double fatḥah, the book gives a different ordinary stopping treatment: the tanwīn nūn is replaced by the sound of an alif. Thus بَصِيرًا at a stop ends with an extended fatḥah, like «بَصِيرَا».
Contrast the two modes: liaison has the audible tanwīn nūn; stopping uses the alif substitution in this form. Written form and specific exceptions still matter.