ないと,なくちゃ => Must do A N3
Needs, Requirement
に[違「ちが」]いない => Without a doubt, A N2
Information, Report
か~ないかのうちに => Right after A, C N2
Time, Situation
ねばならない => Must A N2
Needs, Requirements
にほかならない => Only A N2
Reason, Result, Response
てならない => Very A; Extremely A N2
Degree, Level, Amount
がちです/がちになる => A tends to become/happen/occur N2
Potential, Possibility
ずにはいられない/ないではいられない => Can't help but A; A is unavoidable N2
Will, Decision, “Doing”
なければならない => Must do A; have to A N4
Can, Should, Must
うち/ないうち => While A is the case, B; While A is occuring, B, While A is not occuring, B N3
Conditional, While
なら => If N4
Conditional
ていられない => Cannot continue to A N2
Needs, Requirements