percebesse

first-person form-of imperfect singular subjunctive third-person

perceber の一人称 / 三人称単数不完了接続法

English Meaning

first/third-person singular imperfect subjunctive of perceber

Se ele percebesse o primeiro sinal de mudança, tudo ao seu redor ganharia nova esperança.

もし彼が最初の変化の兆しを感じたなら、彼の周りのすべてが新たな希望を得るでしょう。

If he perceived the first sign of change, everything around him would gain new hope.