时间顺序

I will finish my homework, then I will watch TV.

First, you need to turn on the computer, then you can start working.

条件

If it rains tomorrow, then we will have to cancel the picnic.

结果

She studied hard, then she passed the exam with flying colors.

一系列动作

They chatted for a while and then went to work.

I swam in the swimming pool and then I went home last night.

对比

Now the weather is fine, then cloudy.

这些例句展示了"then"在表示时间顺序、条件、结果、一系列动作以及对比等方面的用法。希望这些例子对你有所帮助!