It happened that as the horse was going a little too fast, and Tom was calling out, "Gently!"

那匹马碰巧跑得有点太快了，于是汤姆喊道：“慢点！”

It happened that she was out when we called.

我们打电话时她刚巧不在家。

It happened that he was not there that day.

偏巧那天他不在。

It happened that I knew his address.

我碰巧知道他的地址。

It happened that I saw him yesterday.

碰巧我昨天看见他了。