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b[S would have done](もし…であれば)〈人・物・事が〉…だった[した]であろうに‖Bill would have died if the doctor had not operated immediately. もし医者がすぐ手術しなかったら, ビルは死🔗🔉

b[S would have done](もし…であれば)〈人・物・事が〉…だった[した]であろうに‖Bill would have died if the doctor had not operated immediately. もし医者がすぐ手術しなかったら, ビルは死んでいたでしょう(=As the doctor operated immediately, Bill didn't die.)/I would never have done what they did. 彼らはあんな事をやってどうしようもないなあ.

ジーニアス英和大辞典 ページ 64005 でのもし…であれば単語。