A single written form may occupy more than one grammatical person slot. Consequently, the form alone does not always uniquely determine the subject.
لَتَفْعَلَنَّ can mean third-person feminine singular or second-person masculine singular.
لَتَفْعَلَانِّ can be third-person feminine dual or either second-person dual.
لَتُفْعَلَنَّ shows the corresponding passive ambiguity in the singular.
The pronoun, relationship to the subject or passive subject, and sentence context determine the intended reading.
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Identical surface forms and their grammatical positions
Emphatic Lām and the Heavy and Light Nūn Paradigms
A single written form may occupy more than one grammatical person slot. Consequently, the form alone does not always uniquely determine the subject.
لَتَفْعَلَنَّ can mean third-person feminine singular or second-person masculine singular.
لَتَفْعَلَانِّ can be third-person feminine dual or either second-person dual.
لَتُفْعَلَنَّ shows the corresponding passive ambiguity in the singular.
The pronoun, relationship to the subject or passive subject, and sentence context determine the intended reading.