~のぼる  => To increase N2
Reach level
... おぼえはない => don't remember... N3
Position, perspective
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