ませんかwon't (hasn't, isn't, doesn't, etc.); won't you
Expression
磨穿鉄硯showing unyielding diligence in one's studies; wearing a hole through one's metal inkstone from constant studying
Noun
ませんでしたsuffix used to negate a verb in the past tense
Expression
ませんかったsuffix used to negate a verb in the past tense
Expression