It might have saved me some trouble had I known the schedule.

如果我知道日程安排的话，就不会那么麻烦了。

youdao

Had I known what was going to happen, I would never have left her alone.

如果我当时知道可能发生的事的话，我就不会撇下她一个人在那里了。

youdao

Had I known that I'd have to drop what I was doing to configure these Settings, I would have headed to my preferences first, then created my Moment.

假如我知道为了这些设置得先放下手头的东西，我肯定会先去调整偏好选项，再去创建Moment。

youdao

One was the ability of the vaccine to prevent infections from the human immunodeficiency virus, better known as H.I.V.

VOA: special.2009.10.13

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

Joe, I've known since I was like, like 12 years old, so he's a good friend.

乔，我从12岁就认识他了，我们是很好的朋友。

一起长大的朋友 - SpeakingMax英语口语达人

And my pay was probably half that of my male counterpart in my first job, had I known.

FORBES: On The 50th Anniversary of 'The Feminine Mystique,' Is There Still A 'Problem That Has No Name?'

Had I known that robots would be able to do that in the near future, I might have changed my mind!

FORBES: Complete Genomics Automates Gene Sequencing With Robots

If I had known the restaurant's name, I would have known it was closed for lunch on Mondays, when I went.

WSJ: Help Wanted: Moonlighters for Mobile Apps