禁止形 => Negative imperative form N4
[禁止「きんし」] => Don't do N4
Can, Should, Must
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1
~ないではすまない / ずにはすまない      => must; will definitely; can't help but to ~ N1
まるで...ない => Absolutely not... N3
Emphasize the negative meaning
まだ~ていない => have not yet ~ N4
ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
たまらない => can not bear N2
Emphasis on degree
ままになる => Just let... N4
Continuous
まだV-られない => Not yet ~ N4
Ability
いまさらながら => Still ... now N3
Time
あまり~ない => not very, not much ~ N5