我们先完成作业，然后可以出去玩。

Let's finish our homework first, ___then we can go out to play.

如果你不喜欢这部电影，那我们去看另一部吧。

If you don't like this movie, ___then let's watch another one.

我先完成了作业，然后去公园散步。

I finished my homework, ___then went for a walk in the park.