but then后加什么

加一般现在时，一般过去时

But then an odd thing happened.

自此以后,怪事迭生。

But then, what does "youth" mean?

那么“年轻”的意思是什么？

But then she moved to California.

但是她后来搬到加利福尼亚去了。

But then HOU only think fun.

但是那时侯都只是觉得好玩。