どれですか => Which one N5
Confirm
ではなかったか => Wasn't it ...? N4
Exclamatory
ではなかったか => Wasn't it? N4
Speculation
…のではなかったか => Wasn't it…? N2
Doubt
であれ~であれ => whether [A] or [B] N1
... るとか ... るとか => それとも... または N4
Demonstrate by example
…のではなかったか => ..., isn't it (Criticism) N2
Criticize
~ 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)
~かれ~かれ      => sooner or later; more or less N1
かれ~かれ => A or B N1
Lists, examples
たしかに/なるほど~かもしれない => might; perhaps N3
Speculation