The indefinite noun immediately after لَا is called اسمُ لَا. In this basic pattern it is accusative and has no tanwin. The information about it is خبرُ لَا; a single-word predicate is nominative.
Part
Grammatical role
Form
رَجُلَ
اسمُ لَا
indefinite, accusative, no tanwin
قَائِمٌ
خبرُ لَا
nominative single-word predicate
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Negating an Entire Class with لَا
The indefinite noun immediately after لَا is called اسمُ لَا. In this basic pattern it is accusative and has no tanwin. The information about it is خبرُ لَا; a single-word predicate is nominative.
Part
Grammatical role
Form
رَجُلَ
اسمُ لَا
indefinite, accusative, no tanwin
قَائِمٌ
خبرُ لَا
nominative single-word predicate