1. 表示“当……时候”这类引导词表示主句动作发生在从句动作进行的过程中。引导词: when, while, as；When the phone rang, I was reading a book.电话铃响的时候，我正在看书。It is easy to be wise after the event.事后诸葛亮容易。While I was walking in the street, I came across an old friend.当我在街上散步时，我遇到了一位老朋友。As he grew older, he became more confident.随着年龄的增长，他变得越来越自信。As she entered the room, everyone fell silent.当她走进房间时，所有人都安静了下来。

2. 表示“在……之前” 和 “在……之后”这类引导词表示主句和从句动作发生的先后顺序。引导词: before, after；Look before you leap.三思而后行。You must finish your work before you go home.你在回家之前必须完成工作。After the children had gone to bed, she finally had some time for herself.孩子们上床睡觉后，她终于有了些自己的时间。After the rain stopped, we went out to play.雨停之后，我们出去玩了。

3. 表示“自从……” 和 “直到……”这类引导词表示时间的起点或终点。引导词: since, until/till；It has been raining non-stop since we arrived here.自从我们到达这里，雨就一直下个不停。He has been living in this city since he was a child.他从小就住在这个城市。Let's wait until the rain stops.我们等到雨停吧。You never know what you can do till you try.不尝试，你永远不知道自己的能力。

4. 表示“一……就……”这类引导词表示主句动作紧接在从句动作之后发生。引导词: as soon as, the moment (that), the minute (that), immediately, directly, instantly；As soon as I heard the news, I called you.我一听到消息就给你打了电话。The moment he saw me, he turned and ran away.他一看到我，转身就跑开了。I recognized you the moment I saw you.我一见到你就认出你了。

5. 表示“每次”、“无论何时”这类引导词表示一种习惯性或规律性的时间关系。引导词: whenever, every time, each time；Whenever I see her, she is always reading.我每次见到她，她总是在看书。Every time I listen to this song, I think of my childhood.每当我听到这首歌，我就会想起我的童年。

本文先对时间状语从句进行简单梳理，后续将就各类引导词的语法要点进行详细分析归纳。