smettessero

form-of imperfect plural subjunctive third-person

smettereの三人称複数半過去接続法

English Meaning

third-person plural imperfect subjunctive of smettere

Era essenziale che smettessero di procrastinare i lavori, altrimenti il progetto avrebbe fallito.

彼らが仕事の先延ばしをやめたならば、さもなければプロジェクトは失敗していただろう.

It was essential that they stopped procrastinating on the work, otherwise the project would have failed.