1 sentence

1. 要不是你的帮助，我不可能完成任务。

   yào​bu​shì nǐ de bāng​zhù, wǒ bù kě​néng wán​chéng rèn​wu.

   If it hadn't been for your help, I wouldn't have been able to complete the task.

   Source: Dong Chinese Dictionary