A practical classification:
Original fatḥah: full still stop; no rawm or ishmām.
Original kasrah: still stop or, if permitted, rawm.
Original ḍammah: still stop, rawm or ishmām when conditions allow.
Incidental vowel: do not treat it as original. In «أَنْذِرِ النَّاسَ» and «عَلَيْكُمُ الصِّيَامُ», the connective vowel does not justify rawm/ishmām.
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Which endings allow rawm and ishmām?
Rules of Waqf — Correct Stopping, Resumption, Rawm, Ishmām and Qurʾānic Orthography
A practical classification:
Original fatḥah: full still stop; no rawm or ishmām.
Original kasrah: still stop or, if permitted, rawm.
Original ḍammah: still stop, rawm or ishmām when conditions allow.
Incidental vowel: do not treat it as original. In «أَنْذِرِ النَّاسَ» and «عَلَيْكُمُ الصِّيَامُ», the connective vowel does not justify rawm/ishmām.