«كَيْفَ» and «كَيْدَهُمْ» have a sākin yāʾ following fatḥah, which makes it a līn yāʾ, unlike the madd yāʾ in «فِي» or «الْفِيلِ».
In ordinary connected recitation, kayfa contains a brief, soft glide. If one deliberately pauses on kayfa, final fāʾ becomes sākin after the līn letter and madd al-līn may arise. Alternate «كَيْفَ» and «فِي» to hear why not every written yāʾ is a long vowel.
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Kayfa and kaydahum: a true līn yāʾ
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
«كَيْفَ» and «كَيْدَهُمْ» have a sākin yāʾ following fatḥah, which makes it a līn yāʾ, unlike the madd yāʾ in «فِي» or «الْفِيلِ».
In ordinary connected recitation, kayfa contains a brief, soft glide. If one deliberately pauses on kayfa, final fāʾ becomes sākin after the līn letter and madd al-līn may arise. Alternate «كَيْفَ» and «فِي» to hear why not every written yāʾ is a long vowel.