جِئْتُ لِأَقْرَأَ — مَا كُنْتُ لِأَكْذِبَ
In jiʾtu li-aqraʾa the lām conveys purpose. In mā kuntu li-akdhiba it is denial-lām because of negated kāna.
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Distinguishing the Two Lāms
The Subjunctive Imperfect and Its Governors
جِئْتُ لِأَقْرَأَ — مَا كُنْتُ لِأَكْذِبَ
In jiʾtu li-aqraʾa the lām conveys purpose. In mā kuntu li-akdhiba it is denial-lām because of negated kāna.