有一些定语从句常可省列引导词

1) 一些表示时间的定语从句可以省列when
* You may go there any time you like. 你随便什么时候都可以去那儿。
* By the time you arrive in London, we will have stayed there for two weeks. 等你到达伦敦的时候我们已经在那里呆了两周了。
* I still remember the first time I met her. 我仍然记得我第一次见他的时候。
* Each time he goes to business trip, he brings a lot of living necessities. 每次出差的时候他都要带很多日常用品。
* Do you know the year the book was published? 你知道那本书出版的年份吗？

2) where 有时也可以省列
* This is the place they met yesterday. 这就是他们昨天碰头的地方。
* That is the place I was born. 这是我出生的地方。

3) 先行词为way 时，定语从句的引导词也可以省列。
* I don't like the way he laughed at me. 我不喜欢他用那种方式来嘲笑我。
* Do it the way I showed you. 按我教你的那样做。
* Stop kicking my dog, or I will treat you the way you treat it! 别再踢我的狗了，不然我会用你对待它的方式修理你！