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
くださいませんか => Could(Would) you please N4
させていただけませんか => Could you please let me do... N4
て下さいませんか => Please do A (polite) N5
Asking and Telling
させてあげる => (Allow) N4
Allow
をくださいませんか => Please give me A (polite) N5
Asking and Telling
さん => Mr., Mrs., Ms. N5
Respectful, humble
させてくれる => Let me... N4
Allow
ません => be not doing something N5
Result status
(さ)せてほしい => Please let me do N3
Allow
させておく => Leave it alone, don't interfere N2
Position, perspective
ませんでした => Did not... N5
Negation in the past