The same broad negative idea can be expressed by different syntactic constructions.
For example, مَا زَيْدٌ قَائِمًا has an accusative predicate, while لَا رَجُلَ قَائِمٌ has a nominative predicate. Meaning alone cannot replace grammatical analysis.
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Why Negation Alone Is Not Enough
Ism of Mā and Lā Resembling Laysa; Khabar of Lā of Generic Negation
The same broad negative idea can be expressed by different syntactic constructions.
For example, مَا زَيْدٌ قَائِمًا has an accusative predicate, while لَا رَجُلَ قَائِمٌ has a nominative predicate. Meaning alone cannot replace grammatical analysis.