then 當副詞用: adv.1. At that time: I was still in school then. Come at noon; I'll be ready then.2. Next in time, space, or order; immediately afterward: I watched the late movie and then went to bed.3. In addition; moreover; besides: It costs $20, and then there's the sales tax to pay.4. Used after but to qualify or balance a preceding statement: The star was nervous, but then who isn't on the first night of a new play.5. In that case; accordingly: If traffic is heavy, then allow extra time.6. As a consequence; therefore: The case, then, is closed.
That time or moment: The bus leaves at four; until then let's walk.
then當形容詞用 :adj.Being so at that time: the then chairman of the board.
then不能當成連接詞用。 所以必須與and, but搭配使用。