かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
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”
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
ていられない => Cannot continue to A N2
Needs, Requirements
くらいなら => I would prefer (doing) B over A N1
Contrast/Surprise
といったらない/といったらありはしない => Extremely A, Very A, A beyond description N1
Degree/ Level/Amount
なければならない => Must do A; have to A N4
Can, Should, Must
とはくらべ[物「もの」]にならない => It's no match for A N1
Comparison/ Exchange
なら => If N4
Conditional
とは限らない => A is not 100% N3
Information, Report