かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
ざるを[得「え」]ない => Only A is left to do/can be done N2
(Not)only, (Not) even
を[禁「きん」]じ[得「え」]ない => Can't help but do A, can't hold back from A (emotional response to something) N1
Will, Decision, Doing