~ぶんには(~分には) => as long as ~ N1
ていけない => Suddenly... N3
Simultaneously
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5
だけしか~ない => only N3
てはいけない => must not; may not; cannot N5
...といけない => If ... then it would be troublesome N2
Recommendations and warnings
~ないといけない      => must do; have an obligation to do ~ N5
Obligatory
…というだけで => just because… N3
Cause, reason
~こと請け合い => I guarantee ... N1
Happens next
~というわけだ => This means~ N1
Conclude
なくてはいけない => must do; need to do N3
Conditions (necessary conditions)
ないといけない / だめだ => must do; have an obligation to do ~ N4
Necessity, obligation