I would not have succeeded but for your help.

要是没有你的帮助，我是不会取得成功的。

But for your help, I could have fed the fishes.

若不是你搭救, 我恐怕已经葬身鱼腹了.

But for your help, I should have failed./ But that you help me, I should have failed.

要不是你帮助，我就会失败。

But for your help, the little boy would have been drowned.

要是没有你们的帮助，那个小男孩早就淹死了。

But for your help we couldn’t have succeeded in the experiment.

如果没有你的帮助，我们的实验是不会成功的。