إِنْ تَدْرُسْ تَنْجَحْ — إِنَّ الطَّالِبَ مُجْتَهِدٌ
Conditional in governs jussive verbs. Emphatic inna instead governs a nominal construction: accusative subject and nominative predicate.
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Conditional In versus Emphatic Inna
The Jussive Imperfect: Governors, Conditions, and Request Responses
إِنْ تَدْرُسْ تَنْجَحْ — إِنَّ الطَّالِبَ مُجْتَهِدٌ
Conditional in governs jussive verbs. Emphatic inna instead governs a nominal construction: accusative subject and nominative predicate.