Not that I know of

She was one of the few that I know of who was subjected to the water torture, which is not dissimilar from what people might know as water-boarding today.

她是我所知的为数不多的几个遭受过水刑的特工之一。她当时遭受的水刑跟当今大家可能知晓的那种是差不多一样严酷的。

Are you going to Washington next month? Not that I know of.

你下个月要去华盛顿 吗 ?没这回事.

I found out that I have no artistic ability at all, and now I know for sure that I do not want to be an artist. However, the class was one of my favorites that year.

我发现自己根本没有艺术能力,现在我确定不想成为一名艺术家。然而,这门课是我那一年最喜欢的课之一。

Now that I know about all the good things ants do, I'm not so afraid of them anymore.

现在知道了蚂蚁做的都是好事，我不再害怕了。

Or is It'some sign of weather that I do not know?

要不,这是什么我不懂得的天气征兆?