ません => be not doing something N5
Result status
ませんでした => Did not... N5
Negation in the past
てすみません => I'm sorry for... N4
じゃありません => not to be N5
Emphasize negative meaning
~ます/~ません => Polite, present form N5
Verb suffixes
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
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
~ませんか => Let's…, Would you like to... 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