名詞 then:

1. that time; that moment

形容詞 then:

1. at a specific prior time

副詞 then:

1. subsequently or soon afterward (often used as sentence connectors)
   同義詞：so, and so, and then
2. in that case or as a consequence
3. at that time

1. He'll be looking for a new secretary then?
   那麼，他就要找個(gè)新秘書了？
2. He took his hat and then left.
   他拿起帽子，隨即離開了。
3. We lived in the country then.
   我們那時(shí)住在鄉(xiāng)下。