It is not seen that if he had not had a window to replace, he would, perhaps, have replaced his old shoes, or added another book to his library.
もし彼が窓ガラスを取り替えていなければ、彼は例えば古くなった靴を買い替えたり、あるいは蔵書に一冊追加したであろうという点は目に見えない事実である。