させてください/させてもらえますか/させてもらえませんか => please let me do N3
かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
~ませんか => Let's…, Would you like to... N5
Verb suffixes
のを知っていますか => Do you know...? N4
いただけませんか => could you please ~ N4
ません => be not doing something N5
Result status
~ます/~ません => Polite, present form N5
Verb suffixes
ませんか => would you; do you want to; shall we ~ N5
くださいませんか => Could(Would) you please N4
....ませんか? => would you; do you want to; shall we ~ N4
Confirm
ませんでした => Did not... N5
Negation in the past
させていただけませんか => Could you please let me do... N4