My God, I've never seen you so nervous.

我的天呀！我从没见你这么紧张过。

《柯林斯英汉双解大词典》

I've never seen you so wound up.

我从来没有看过你如此紧张。

youdao

I've never seen you have such confidence before an exam.

我从来没有见过你在考试前这么有信心。

youdao

You never seen a frog so honest and simple as he was, for all he was so skilled.

VOA: special.2009.08.29

I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?

但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？

麻省理工公开课 - 计算机科学及编程导论课程节选

What this basically means is, you're given some problem to solve, that you've never seen before.

我们还会再讲讲这些内容,最基本的意思就是你有一个问题要处理。

麻省理工公开课 - 计算机科学及编程导论课程节选

"I've never seen you this excited, " said my friend Alison, a cookbook designer, when Lolo presented the Raveneau.

WSJ: The Winter Pleasures of Burgundy's Beaune | On Wine by Lettie Teague

Even if you had never seen the ocean you had a picture of it in your head from what you had been told by foreign people who sometimes came upriver.

NEWYORKER: Invitation to a Beheading

You have never seen someone weep until you have witnessed a mother at the funeral of her murdered child.

NPR: Excerpt: 'Then We Came to the End'