The key question is not merely “which noun has fathah?” Ask which grammatical role causes nasb.
CauseMansub targetExampleمَا / لَا working like لَيْسَkhabarمَا هَذَا بَشَرًالَا negating the whole classism of لَالَا رَيْبَ فِيهِmudaf noun after يَاmunada mudafيَا عَبْدَ اللَّهِ
Name the cause first; then identify the mansub noun.
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The key question is not merely “which noun has fathah?” Ask which grammatical role causes nasb.
CauseMansub targetExampleمَا / لَا working like لَيْسَkhabarمَا هَذَا بَشَرًالَا negating the whole classism of لَالَا رَيْبَ فِيهِmudaf noun after يَاmunada mudafيَا عَبْدَ اللَّهِ
Name the cause first; then identify the mansub noun.