我不知道为什么他们晚上也呆在那，但是我听到了炮火声和喊叫声。

I don't know what they did up there at night, but we would hear gunfire and yelling.

youdao

但是王子说：“让我们把她当作一个恩赐，然而，我不知道为什么，但是我的心已经被这个美丽的孩子揪住了，我觉得我不能离开她。”

But the prince answered, "Let me have it as a gift, then." I know not why, but my heart is drawn towards this beautiful child, and I feel I cannot live without her.

youdao

我不知道为什么，但是上帝选择了用财富作为我们信仰的严峻考验。

I don't know why but God has chosen money to be theacid test of our faith.

youdao

which is, I don't know why I really wanted the tent, but I really, really did.

当时，不知道为什么我那么想要，但是确实很想要。

FAO Schwarz的回忆 - SpeakingMax英语口语达人