计算机教程网告诉你用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。连接时间状语从句的连接词有：when, before, after, while, as soon as, until, since...... 这里要注意一点的是，如果主句是一般将来时，从句只能用一般现在时表示将来意义。
 I'll call you when I get there. 我到了那里就给你电话
 She told me something interesting as we talked on our way home. 当我们在回家的路上交谈时，她告诉我一些有趣的事情。
 While I came home my wife was cooking dinner. 我回家时，妻子在做晚饭。
 Please knock at the door before you come in my bed room.在你进入我卧室之前，请敲门。
 His reputation will live long after his death. 他将英名永存。
 I will give it back to you as soon as I have read it. 我读完它就给回你
 He has studied very hard since he came to our school. 自从他来到我们学校，他学习就非常努力。
 Mary didn't go to bed until his father came back. 玛丽直到她爸爸回来后才去睡觉。
 You can call me whenever you like. 你什么时候给我电话都可以。
 Once you feel lonely, come and have a chat with me. 你一感到孤单，就来和我聊一下吧。
 It reminded me of the good time in the past years every time I saw the photo. 每次我看着照片都会想起过去的美好时光。
 Now that you are free, you can enjoy music for a while. 既然有空，你可以欣赏一下音乐。

【高中以上】
 You can come and stay with us for several days next time you visit London. 下次你来伦敦时，可以和我们一起住几天。
 All the students were quiet directly the teacher came in the classroom. 老师进入课室时，所以的学生立刻静下来。
 He turns on the computer the moment he came in. 他一进来就打开电脑。
I wrote back to him immediately I received his letter. 我一收到他的信就马上回信了。
 He had hardly arrived when it began to snow. 他刚一到就开始下雪了。
 I had no sooner gone out than it began to rain. 我刚走到外面就开始下雨了。



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