and then some

1. 至少; 远不止此

This will need all his courage and then some.

这将至少需要他拿出全部勇气。

by then

1. 到那时

I think I should have finished it by then.

我想到那时我应该完成了。

from then on

1. 从那时起

From then on, the prince and princess lived happily.

从那时起, 王子与公主就幸福地生活在一起。

since then

1. 从那时以来

They have been good friends since then.

从那时起他们就一直是好朋友。

then and there

1. 当时当地; 当场

He turned down their proposal then and there.

他当场就拒绝了他们的建议。

then what

1. 下一步怎么办, 然后怎么办

After we finish this, then what?

我们完成后, 下一步怎么办呢?