I wish I had known him then.

我真希望那时认识他。

youdao

I wish I had known you ten years ago.

真希望十年前就已经认识你。

youdao

I wish I had known about this restaurant before.

我真希望我以前就知道这家餐馆。

youdao

And humankind receives its first set of explicit laws, no more implicit, "Murder is bad." "Oh I wish I had known!"

人类要接受明确的律法，而非隐晦的，谋杀是不好的，哦！我要是早知道就好了“

耶鲁公开课 - 旧约导论课程节选

Here are a few things I wish I had known before I started my company (Part 1).

FORBES: 10 Lessons From an Accidental Entrepreneur (Part 1)

This is an impossible goal to achieve and I wish I had known that when I was 13.

BBC: Jennie Runk: My life as a 'plus-size' model

One such superstition tells us that eating poultry on New Year's Day means you will financially struggle for the coming year, which I really wish I had known before I ate chicken with mixed vegetables on January 1.

CNN: Enough with the Happy New Year already