I can not tell you why, but please do what I ask you, and never come near the moor again.

我不能告诉您缘由，可是请照我说的去做，千万不要再靠近沼地了。

youdao

If they ask you whether they've told you this story before, why not say "Yes, but could you tell it again because I've forgotten some details?"

如果他们问你是否能之前听过这个故事，为什么不说“是的，但是可以再跟我讲一遍吗，因为我已经忘记一些细节了？”

youdao