Question

لَمْ يُفْعَلْنَ Passive (1st letter excl. لم becomes ضَمَّة and 2nd last letter becomes فَتْحَة) I.e. compared to active version اِنْ / لَمْ / لِ  / لاَ  cause it to become  جَزْم

Accepted Answer

They (P/F) did not do لَمْ  changes meaning of word from he does to he did not do - paste tense and negation مَبْنِي  stateless - 3rd person feminine plural - final noon indicates subject i.e. a group of women

Front	لَمْ يُفْعَلْنَ
Back	They (P/F) did not do
Back2	Passive (1st letter excl. لم becomes ضَمَّة and 2nd last letter becomes فَتْحَة) I.e. compared to active version
Back3	لَمْ changes meaning of word from he does to he did not do - paste tense and negation
Back4	اِنْ / لَمْ / لِ / لاَ cause it to become جَزْم
Back5	مَبْنِي stateless - 3rd person feminine plural - final noon indicates subject i.e. a group of women

لَمْ Letter I.E يُفْعَلْنَ P/F Passive 1st Excl