In إِنْ تَجْتَهِدُوا تَنْجَحُوا, both five-verb forms lose their final nūn in the jussive. The wāw is the subject pronoun.
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In with the Five Verbs
Conditional Particles: In, Law and Ammā
In إِنْ تَجْتَهِدُوا تَنْجَحُوا, both five-verb forms lose their final nūn in the jussive. The wāw is the subject pronoun.