ませんでした => Did not... N5
Negation in the past
~ました/~ませんでした => Polite, past form of verb N5
Verb suffixes
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
~ ほうがましだ => better than; would rather ~ N1
Evaluate
じゃありませんでした => was not, were not N5
Emphasize negative meaning
~ようが...まいが => whether or not; regardless N1
(さ)せてほしい => Please let me do N3
Allow
させていただけませんか => Could you please let me do... N4
... はいけません => must not; may not; cannot N4
Ban
いただけませんか => could you please ~ N4
いたします => to do (polite form of します) N4
~ます/~ません => Polite, present form N5
Verb suffixes