It would be disingenuous of me to claim I had never seen it.

要说我从未看到过，那就是言不由衷了。

《牛津词典》

I've seen it happen.

我看到它已经开始了。

youdao

You should have seen it!

你应该看见的！

《牛津词典》

She had seen it on the other side of the forest.

VOA: special.2010.04.03

It appears to be useful in that way but I imagine it does more compelling things these days but I have not seen it myself.

那样看起来仿佛比较有效果,但我想这些天它非常引人注目,只是我自己没看到而已。

哈佛公开课 - 计算机科学课程节选

I haven't seen it, but one of my sister's favourite films. So yeah, I think, all these cultures,

我没有看过，但是它是我姐姐最喜欢的电影之一。所以，我认为，所有的这些文化，

国际城市，伦敦 - SpeakingMax英语口语达人

Simply nowhere in the mass media have I seen it reported how strong third-quarter earnings were.

FORBES: Media Mayhem

We've had a quick chat in this office and reckon it's the first time we've seen it happen.

BBC: Six of the best from the Chief Whip

"I have never seen it happen that a boss can work through a second-in-command, " says Xavier.

FORBES: Magazine Article