I very well know.

我知道得很清楚。

youdao

"How well do you know her?"—"Not very."

“你对她有多了解？” —“不是很多。”

《柯林斯英汉双解大词典》

"I see you know how to swim very well," she said, watching him do the backstroke.

“看来你很会游泳啊”，她一边说一边看他仰泳。

《柯林斯英汉双解大词典》

"I didn't know my father very well.

VOA: special.2009.12.13

We know very well, by the way, that there are scientists who simply cannot stand to read poetry because it's false, right?

我们清楚的知道，有些科学家,不能忍受诗歌因为他们认为诗歌是伪造的？

耶鲁公开课 - 文学理论导论课程节选

and so there are some products where... at least, as far as, I don't know this field very well,

所以有的产品……至少，我对这个领域不是很了解，

广告和价格的关系 - SpeakingMax英语口语达人

One of these notes simply including a synopsis of the market commentary of a very well know market guru.

FORBES: Are You Talking To Your Clients?

Even as the tax-cut debate rages, Congress is busy writing laws that make a mockery of next year's spending projections as the Republicans very well know.

ECONOMIST: The truth about taxes

An older geologist might very well know where they are.

WSJ: In Geology, Old-Timers Can Be Worth Their Weight in Gold