When no preposition governs an adverb of time, it is mansub.
Two common appearances:
- يَوْمَ السَّبْتِ — يَوْمَ is mudaf, so it has no tanwin; السَّبْتِ is mudaf ilayh.
- شَهْرًا and صَبَاحًا — each stands without an idafah complement, so it appears mansub with tanwin.
The absence of tanwin in يَوْمَ comes from idafah; it remains mansub as the adverb of time.
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When no preposition governs an adverb of time, it is mansub.
Two common appearances:
- يَوْمَ السَّبْتِ — يَوْمَ is mudaf, so it has no tanwin; السَّبْتِ is mudaf ilayh.
- شَهْرًا and صَبَاحًا — each stands without an idafah complement, so it appears mansub with tanwin.
The absence of tanwin in يَوْمَ comes from idafah; it remains mansub as the adverb of time.