contribuyerais

form-of imperfect plural second-person subjunctive

contribuir の二人称複数未完了接続法

English Meaning

second-person plural imperfect subjunctive of contribuir

Si vosotros contribuyerais con entusiasmo en la organización, el evento sería un gran éxito.

もしあなた方が熱意をもって組織に貢献すれば、そのイベントは大きな成功を収めるだろう.

If you all contributed enthusiastically to the organization, the event would be a great success.