First-person active forms are distinguished by their prefixes:
Word / formMeaning / explanation
لَأَفْعَلَنَّfirst person singular
لَنَفْعَلَنَّfirst person plural
لَأَفْعَلَنَّI will certainly do.
لَنَفْعَلَنَّwe will certainly do.
After the emphatic lām, أَ marks first-person singular while نَ marks first-person plural. Both have fatḥa before the heavy nūn, so the prefix is decisive.
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Emphatic Lām and the Heavy and Light Nūn Paradigms
First-person active forms are distinguished by their prefixes:
Word / formMeaning / explanation
لَأَفْعَلَنَّfirst person singular
لَنَفْعَلَنَّfirst person plural
لَأَفْعَلَنَّI will certainly do.
لَنَفْعَلَنَّwe will certainly do.
After the emphatic lām, أَ marks first-person singular while نَ marks first-person plural. Both have fatḥa before the heavy nūn, so the prefix is decisive.