زَيْدٌ شَاعِرٌ لَا كَاتِبٌ
Zayd is a poet, not a writer.
The coordinating lā affirms poet-hood and negates the competing description of writer-hood. It does not necessarily deny every attribute beyond those two; the alternatives made relevant by discourse determine the scope.
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Qasr by Coordination, Negation–Exception, and Innamā
زَيْدٌ شَاعِرٌ لَا كَاتِبٌ
Zayd is a poet, not a writer.
The coordinating lā affirms poet-hood and negates the competing description of writer-hood. It does not necessarily deny every attribute beyond those two; the alternatives made relevant by discourse determine the scope.