When the two emphasis markers are used in this construction, the Mudhaari' meaning becomes specifically future and strongly emphasized.
MeaningForm
he does / he will doيَفْعُلُ
he will certainly doلَيَفْعَلَنَّ
Main map: Laam at the beginning + Noon at the end = emphatic future construction.
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Introduction to Emphatic Laam and Noon of Emphasis
When the two emphasis markers are used in this construction, the Mudhaari' meaning becomes specifically future and strongly emphasized.
MeaningForm
he does / he will doيَفْعُلُ
he will certainly doلَيَفْعَلَنَّ
Main map: Laam at the beginning + Noon at the end = emphatic future construction.