In the basic pattern, a single-word predicate is nominative. The noun of لَا remains indefinite, accusative and without tanwin.
Sentence
اسمُ لَا
خبرُ لَا
Meaning
لَا رَجُلَ قَائِمٌ
رَجُلَ
قَائِمٌ
No man is standing
لَا سُرُورَ دَائِمٌ
سُرُورَ
دَائِمٌ
No happiness lasts forever
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Negating an Entire Class with لَا
In the basic pattern, a single-word predicate is nominative. The noun of لَا remains indefinite, accusative and without tanwin.
Sentence
اسمُ لَا
خبرُ لَا
Meaning
لَا رَجُلَ قَائِمٌ
رَجُلَ
قَائِمٌ
No man is standing
لَا سُرُورَ دَائِمٌ
سُرُورَ
دَائِمٌ
No happiness lasts forever