要不是

要不是你提醒我，我就忘了。

Yàobùshì nǐ tíxǐng wǒ, wǒ jiù wàng le.

If not for your reminder, I would have forgotten.

要不是下雨，我们就去爬山了。

Yàobùshì xiàyǔ, wǒmen jiù qù páshān le.

If it weren't for the rain, we would have gone hiking.

要不是他帮忙，这个任务不可能完成。

Yàobùshì tā bāngmáng, zhège rènwù bù kěnéng wánchéng.

If not for his help, this task couldn't have been completed.