Every passive command keeps the prefixed command-Laam and takes Heavy Noon.
PluralDualSingularGroup
لِيُفْعَلُنَّلِيُفْعَلَانِّلِيُفْعَلَنَّmasculine Ghaa'ib
لِيُفْعَلْنَانِّلِتُفْعَلَانِّلِتُفْعَلَنَّfeminine Ghaa'ib
لِتُفْعَلُنَّلِتُفْعَلَانِّلِتُفْعَلَنَّmasculine Haadhir
لِتُفْعَلْنَانِّلِتُفْعَلَانِّلِتُفْعَلِنَّfeminine Haadhir
لِنُفْعَلَنَّ—لِأُفْعَلَنَّMutakallim
The passive voice is recognized from the passive vowel pattern inside the verb.