from then on從那時起
From then on, the prince and princess lived happily.
從那時起, 王子與公主就幸福地生活在一起。
since then從那時以來
They have been good friends since then.
從那時起他們就一直是好朋友。
then and there當時當地; 當場
He turned down their proposal then and there.
他當場就拒絕了他們的建議。
then what下一步怎么辦, 然后怎么辦
After we finish this, then what?
我們完成后, 下一步怎么辦呢?