Lan governs the subjunctive (naṣb). In the five conjugation positions whose ordinary indicative imperfect ends in a ḍamma, that ḍamma becomes a fatḥa.
Word / formMeaning / explanation
يَفْعَلُ ← لَنْ يَفْعَلَhe will not do.
تَفْعَلُ ← لَنْ تَفْعَلَyou (masc.) will not do, or she will not do.
أَفْعَلُ ← لَنْ أَفْعَلَI will not do.
نَفْعَلُ ← لَنْ نَفْعَلَwe will not do.
Correct negation requires both the particle and the appropriate change to the verb ending.
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Negating the Imperfect with Lan and Lam: Subjunctive, Jussive and Full Paradigms
Lan governs the subjunctive (naṣb). In the five conjugation positions whose ordinary indicative imperfect ends in a ḍamma, that ḍamma becomes a fatḥa.
Word / formMeaning / explanation
يَفْعَلُ ← لَنْ يَفْعَلَhe will not do.
تَفْعَلُ ← لَنْ تَفْعَلَyou (masc.) will not do, or she will not do.
أَفْعَلُ ← لَنْ أَفْعَلَI will not do.
نَفْعَلُ ← لَنْ نَفْعَلَwe will not do.
Correct negation requires both the particle and the appropriate change to the verb ending.