如果你明天没空，那么我们可以改天再约。

If you're not free tomorrow, ___then we can meet another day.

如果你饿了，那就吃点水果吧。

If you're hungry, ___then have some fruit.

“要下雨了。”“那我们该现在就走吗？”

'It's going to rain.' 'We should leave now, ___then?'