at that time in the past or future
Back then, we didn't have smartphones, so we played outside more.
那时候,我们没有智能手机,所以我们在外面玩得更多。
next in order or time
First, mix the flour and eggs, then add the milk slowly.
首先,混合面粉和鸡蛋,然后慢慢加入牛奶。
as a result or consequence
If it rains, then we will stay inside and watch a movie.
如果下雨,那么我们就待在室内看电影。
in addition to what was said
She finished her work, and then she had to help her brother with his homework.
她完成了工作,然后还得帮弟弟做作业。
to summarize what was just said
So then, the main points are to be on time and bring your own materials.
那么,主要要点就是准时并自带材料。
to start or end a conversation or statement
Okay then, let's begin the meeting now that everyone is here.
好吧,既然大家都到了,我们就开始会议吧。
being the person in a role at that past time
The then mayor made that decision during the crisis.
当时的市长在危机期间做出了那个决定。