Sāʿataʾidhin follows the same structure as yawmaʾidhin and ḥīnaʾidhin, with tanwīn replacing a clause after idh.
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The Same Pattern with Another Adverb
Tanwīn: Five Types, Their Function, and Omission
Sāʿataʾidhin follows the same structure as yawmaʾidhin and ḥīnaʾidhin, with tanwīn replacing a clause after idh.