ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
てたまらない => Very A; Extremely A; Really want to do A N2
Degree, Level, Amount
あまり~ない => Not very ~ N5
Amount
ねばならない => Must A N2
Needs, Requirements
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”
てもかまわない => No problem N4
Can, Should, Must
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
させて[頂「いただ」]きます/させてもらいます => Allow me to A N1
Miscellaneous
ないまでも => Even if A isn't done N1
(Not)only , (Not) even
までもない => It's not necessary for A N1
Need/Requirements
ていられない => Cannot continue to A N2
Needs, Requirements