禁止形 => Negative imperative form N4
~はめになる(~羽目になる)     => to get stuck with (some job); to end up with (something unpleasant) N1
[禁止「きんし」] => Don't do N4
Can, Should, Must
めったにない => Rarely N3
Degree. Level, Amount
めったに~ない => hardly; rarely; seldom N3
ひとつには…ためである => Partly because of ... N3
Cause, reason
~ためしに…てみる => to attempt, to test, to try out N1
Invite and advise
始める => to start; to begin to ~ N4
~んがため(に)/~んがための      => in order to ~ N1
ため(に) => For, because… N4
Cause and Effect
あらためる => to revise; to replace N3
Happens next
めったな => hardly; rarely; seldom N2
Ban