Jussive changes are visible on an imperfect verb; a past verb remains built and does not change for jussive.
إِنْ حَضَرَ الْمُعَلِّمُ نَبْدَأْ
حَضَرَ is past in form and remains unchanged. نَبْدَأْ is an imperfect answer and shows final sukun.
إِنْ تَجْتَهِدْ نَجَحْتَ
تَجْتَهِدْ is an imperfect condition and shows final sukun. نَجَحْتَ is past in form and remains unchanged.
Do not add a jussive ending to a past verb.
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Conditional Sentences with إِذَا and لَوْ
Jussive changes are visible on an imperfect verb; a past verb remains built and does not change for jussive.
إِنْ حَضَرَ الْمُعَلِّمُ نَبْدَأْ
حَضَرَ is past in form and remains unchanged. نَبْدَأْ is an imperfect answer and shows final sukun.
إِنْ تَجْتَهِدْ نَجَحْتَ
تَجْتَهِدْ is an imperfect condition and shows final sukun. نَجَحْتَ is past in form and remains unchanged.
Do not add a jussive ending to a past verb.