إِنَّ زَيْدًا لَيَقُومُ. — إِنَّ زَيْدًا لَقَائِمٌ.
The emphatic lām can accompany an imperfect or an adjectival predicate after inna. It does not make the imperfect jussive.
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Emphatic Lām with Verb and Noun
The Imperfect Verb: Recognition, Time, Prefixes and Mood
إِنَّ زَيْدًا لَيَقُومُ. — إِنَّ زَيْدًا لَقَائِمٌ.
The emphatic lām can accompany an imperfect or an adjectival predicate after inna. It does not make the imperfect jussive.