then作时间状语用一般用过去时态。
She looked out of the window every now and then .她不时向窗外探望。
Then it is often called survivor growth .为此，常称它为生存木生长。
Then suddenly he was struck violently .后来他突然重重地挨了一下揍。
Till then i may occupy her room .打现在到那时，我可以占有她的房间。
He had changed， himself， since then .从那时起，他自己也改变了很多。
通常then意思是（指过去）那时，当时（指将来）到那时，届时.是一般过去式的标志.当表示“其次.接着”讲时，可以用一般现在或一般过去!.例：They chatted for a while and then went to work.他们聊了一会儿，然后上班去了 will the manager be available， then?那么经理什么时候可以接见我呢?当then［与now，sometimes等连用］(一会儿.)一会儿又.：Now the weather is fine，then cloudy.天气一会儿好，一会儿阴.