否定 ひてい疑問 ぎもん ぶんでしょう
hiteigimombundeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 否定疑問文

1. Wouldn't you say…?; Don't you think…?; Isn't it…?

Polite
Presumptive
Conjecture
Linguistics