..... ばかりもいられない => can't keep doing ~ N2
Speculation
ばかりはいられない => can’t keep doing ~ N2
~ ば/たら~かもしれない => If only... then... N2
Regret
~ ば/たら~かもしれない => If...then maybe... N3
Condition (hypothetical condition)
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5
てばかりはいられない => Cannot always A N2
Needs, Requirements
といえば~かもしれない => Speaking of..., it might be... N3
Speculation
…となれば => if that happens N2
Deduce
からでないと/からでなければ => must first do; cannot do without first doing ~ N2
なければ ~ない => must do something; have to do something N4
Conditions (necessary conditions)
~てはばからない      => reckless; fearless … N1
なければならない => Must do A; have to A N4
Can, Should, Must