ذَهَبْتُ مُبَكِّرًا لِئَلَّا أَتَأَخَّرَ.
I left early so that I would not be late. Lām expresses purpose, overt an governs, lā negates, and ataʾakhkhara is subjunctive.
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Parsing Liʾallā
The Subjunctive Imperfect and Its Governors
ذَهَبْتُ مُبَكِّرًا لِئَلَّا أَتَأَخَّرَ.
I left early so that I would not be late. Lām expresses purpose, overt an governs, lā negates, and ataʾakhkhara is subjunctive.