8.I have no beans about this. 我对此一窍不通。
beans（豆）意指“无价值”，象征极微小的东西。与know合在一起就相当于know little about 的意思了，也就等于我们所讲的一窍不通了。
I'd like to. But I have no beans about this. 我很想帮你，但是我对此一窍不通啊。