since I found out clowns were just people with makeup.我发现小丑不过是人化妆扮成的开始的

find out发现；找出来；揭发

You can find out many advantages in urban life.

你会发现都市生活中有许多便利之处。

I am trying to find out experience in teaching.

我在摸索教学经验。

Um, as a matter of fact, by the time I was a teenager,实际上，当我成长为小少年的时候

as a matter of fact事实上

As a matter of fact, I've never been there before.

事实上我从未到过那儿。

As a matter of fact, light is a form of energy.

其实，光是能的一种形式。

by the time到…时候

By the time we arrived the meeting was over.

我们到达时，会议已结束了。

The party was wellnigh over by the time we arrived.

我们到达时，聚会差不多快结束了。