The textbook's nūn-deletion rule applies to seven positions in the fourteen-slot paradigm. Seven positions do not necessarily mean seven different written shapes; some positions coincide.
Third person: يَفْعَلَا، يَفْعَلُوا، تَفْعَلَا.
Second person: تَفْعَلَا، تَفْعَلُوا، تَفْعَلِي، تَفْعَلَا.
For example, لَنْ تَفْعَلَا appears for a pair of males and a pair of females being addressed, and also for two females spoken about. Pronouns and sentence context determine the intended person.
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Seven paradigm positions governed by nūn-deletion
Negating the Imperfect with Lan and Lam: Subjunctive, Jussive and Full Paradigms
The textbook's nūn-deletion rule applies to seven positions in the fourteen-slot paradigm. Seven positions do not necessarily mean seven different written shapes; some positions coincide.
Third person: يَفْعَلَا، يَفْعَلُوا، تَفْعَلَا.
Second person: تَفْعَلَا، تَفْعَلُوا، تَفْعَلِي، تَفْعَلَا.
For example, لَنْ تَفْعَلَا appears for a pair of males and a pair of females being addressed, and also for two females spoken about. Pronouns and sentence context determine the intended person.