1.用作副词，表示“那时”，可用于过去或将来。2.表示“然后”、“接着”，通常与连词and连用。3.表示“那么”、“既然是那样”、“这么说来”，通常用于句首或句末。
then的用法例句
1.You have to do everything you can. You have to work your hardest. And if you do, if you stay positive,then you have a shot at a silver lining.
你必须全力以赴，最大限度地去努力。如果你这么做，并且保持乐观，你就会看见乌云背后的幸福线。
2.It was just then that I chanced to look round.
就在那时，我恰好环顾了下四周。
3.He then held the man in an armlock until police arrived.
然后他反扭住那名男子的手臂让他动弹不得，直到警察赶到。
4.Then something seemed to snap in me. I couldn't endure any more.
这时候，我的心里像有个东西突然绷断了——我再也忍受不了啦。
5."His memory must be completely back,then?" — "Just about."
“这么说，他的记忆一定是完全恢复了?”——“差不多。”