[切「き」]れない => Can't finish/complete A N3
Potential, Possibility
てばかりはいられない => Cannot always A N2
Needs, Requirements
なりに,なりの,それなり => In A's own way, in a(n) A way N1
Adjectival, Descriptions
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”
なり~なり => A or B N1
Lists, examples
あまり~ない => Not very ~ N5
Amount
ていられない => Cannot continue to A N2
Needs, Requirements
なければならない => Must do A; have to A N4
Can, Should, Must
かぎり/ないかぎり => While A is the case/still true N2
Conditional, While
~かもしれない => Might A, maybe A, perhaps A N4
Sentence Endings
かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
てくれてありがとう => Thank you for doing A N4
Honorifics