ねばならない/ねばならぬ/ねば => have to do; must; should ~ N2
ね => isn't it? right? eh? N5
かねない => Afraid that N2
Potential, Possibility
ね => Requests confirmation from the listener N5
Particles
ねばならない => Must A N2
Needs, Requirements
かねる => unable to do something; can’t do something N2
かねない => (someone) might do something; something might happen N2
[兼「か」]ねて => Also for the purpose of A N1
Miscellaneous
お…ねがう => please do; could you please…; I ask of you to ~ N4
Respectful, humble
しかし => But, nevertheless N5
Change the subject of the story
し(~し) => and ... N4
Cause and Effect
もし~としても/もし~としたって => Assuming; Even if ~ N3