たぶん => Maybe... N4
Speculation
~んがため(に)/~んがための      => in order to ~ N1
たぶん => perhaps; probably N4
たとたん(に) => as soon as; just as ~ N3
んだった => If... (express regret) N2
Regret
...たいんですが => want N4
How to say the beginning
いったん~ば/と/たら   => Once you do something N2
Necessity, obligation
ませんでした => Did not... N5
Negation in the past
たとたん => As soon as A (occured), B N3
Time, Situation
たいへんだ => It is hard, serious N4
Evaluate
ほとんど…た => hardly any, almost all N2
Description
たいへん => very; greatly; terribly; serious; difficult N4
Evaluate