1 (at) that time 那时；当时: In 1990? I was at university then. 1990年？我当时在大学念书。I spoke to him on Wednesday, but I haven't seen him since then. 我星期三跟他说过话，但此后我再没有见过他。They met in 1941 and remained close friends from then on. 他们在1941年相识，从那时起一直是亲密朋友。I'm going tomorrow. Can you wait until then ? 我明天去，你可以等到那时吗？Phone me tomorrow -- I will have decided by then. 明天给我打电话─到那时我会做出决定了。

2 next; after that 接着；然后: I'll have a shower and get changed, then we'll go out. 我去淋个浴，换一换衣服，然后我们就出去。There was silence for a minute. Then he replied. 沉默一会儿后，他作出回答。

3 used to show the logical result of a statement or situation （用于表示某番话或某种情况的合理结果）: ‘I don't feel at all well.’ ‘Why don't you go to the doctor then?’ “我觉得很不舒服。”“那为什么不去看医生？”If you don't do any work then you'll fail the exam. 你如果不学习，那你考试就会不及格。

4 (spoken 口语) (used after words like now, okay, right, etc to show the beginning or end of a conversation or statement) （用于now、okay、right等词之后，表示谈话或陈述的开始或结果）: Now then, are we all ready to go? 那么，我们都准备好出发没有？Right then, I'll see you tomorrow. 好，明天见。