إِنْ تُهْمِلْ دَرْسَكَ فَلَنْ تَنْجَحَ.
Translation: If you neglect the lesson, you will not succeed.
Tuhmil is jussive as the condition; tanjaḥa is subjunctive because of lan. Fāʾ links the whole answer.
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Obligatory Fāʾ: Lan in the Answer
The Jussive Imperfect: Governors, Conditions, and Request Responses
إِنْ تُهْمِلْ دَرْسَكَ فَلَنْ تَنْجَحَ.
Translation: If you neglect the lesson, you will not succeed.
Tuhmil is jussive as the condition; tanjaḥa is subjunctive because of lan. Fāʾ links the whole answer.