now and then

NOW
adj.
1. 現在,目前,此刻
I used to live in Tainan but now I live in Taipei.
我過去住在臺南,但現在住在臺北。
2. 立刻,馬上
Go now or you'll be late.
你得馬上走,不然就要遲到了。
THEN
adj.
1. 那時,當時
He worked in that factory then.
他那時在那個工廠工作。
2. 然後,接著
They chatted for a while and then went to work.
他們聊了一會兒,然後上班去了。

now (現在) = present tense OR future tense

then (然後) = first, ............. Then, ............... Finally(OR at last), ...........