碰巧，她的生日在我的生日之后一天。

___As ___it ___happens, her birthday is the day after mine.

碰巧，我目前正在为自己寻找计算机课程，我想加入你们的一个课程。

___As ___it ___happens, I am currently looking for a computer course for myself and I would like to join one of your courses.

碰巧，你打电话时我刚好在想你。

___As ___it ___happens, I was just thinking about you when you called.