He told me he would come, but I don't know when
(he would come). 他告诉我他来，但我不知道他什么时候来。
One of the Nobel Prize winners was a graduate of our university, but I forgot which.
Her pleasure in spending enormous amounts is actually greater than the pleasure (that) she gets from the things (that) she buys. 她大笔花钱所获得的乐趣实际上远远大于她所购买的东西给 她带来的乐趣。 1.3并列句中的省略 （1）在以and、but、or连接的并列句中，后面分句中与前面 相同的部分常省略。例如：
其中有一位诺贝尔获奖者是我们大学的毕业生，但我忘记 了是哪一位。
Someone has borrowed my book, but I don't know who (has borrowed it).
有人借了我的书，但我不知道是谁。
（4）定语从句中常省略作宾语的关系代词，在way（表方式 ）, time, moment后面的that也常省略。例如：
Your opinion, whether right or wrong, deserves our attention.
无论正确与否，你们的意见都值得我们关注。
Although frightened, he tries to call the police when he witnessed the accident.
第二十四章 省略与替代
1.省略的种类 2.替代的种类 3.省略和替代关系
1.省略的种类
1.1对话中的省略
在对话中，问句通常用完全句，而答句用省略句（省略主语 、谓语或其他成分）。例如： “Would you like to go for a walk?” “你想去散步吗？” “Yes, I'd love to.” “是的，我想去散步。” “Is she going to school?” “她现在去上学吗？”
All (that) she said is very interesting 她说的一切都非常有趣。
The man (whom, that) you want to see has left. 你想见的人已经离开了。
Do you know the way (that) he dealt with the problem? 你知道他处理这个问题的方法吗？
Mary ordered an ice-cream, and Jack (ordered) a fruit juice. 玛丽要了一客冰激凌，杰克要了一杯果汁。
Don't say anything unless asked. 除非有人问，不要讲任何事。
While crossing the street, don't forget to look at the traffic light. 过马路时，别忘记看交通指示灯。
Employees are encouraged to use their initiative if faced with a problem. 员工如果遇到问题，鼓励他们自行决断。
1.2复合句中的省略
(1)在由as, as if, if, no matter how, while, when, where, whether, though/although, once, unless, until等引导的状 语从句中，其谓语动词为be，且主语又与主句主语相同 时，该从句的主语和谓语动词be通常省略。例如： He took a lot of photos while on a visit to Chicago. 在去芝加哥旅行时他照了许多照片。 When in doubt, do not hesitate to ask me. 要是有疑问，尽管来问我。

(2) 在以than, as 引导的比较状语从句中，与主句相同的部分通 常被省略。例如：
The population of this area is many times more than (it is large) fifteenth years ago. 该地区的人口要比十五年前多许多倍。
Tom is now as diligent in his studies as he was (diligent) at that time. 汤姆现在要比那时学习更勤奋了。
We should think more of others than (we think) of ourselves. 我们应该更多地想到他人，更少地想到自己。 I get up earlier than I ought to (get up). 我比应该起床的时间起得要早。 Susan can speak Spanish fluently than Jane (can speak). 苏珊得西班牙语比珍妮讲得流利。 (3) 在宾语从句由which, when, how, why, who等疑问词引导 时，可只保留疑问词，省略其后的分句。例如：
Our new English teacher is young and (he is)
.
knowledgeable. 我们的新英语老师年轻而且学识渊博。
Many students can write English but (they) can't speak it very well. 许多学生能写英语，却不能讲得很好。
尽管很害怕，但当他目击事故时还是报了警。
No artistic creation can achieve greatness if (it is) divorced from life.
如果脱离生活，任何艺术创造都不会伟大。
The stories will be very popular once (they are) put on TV. 一旦出现在电视上，这些故事将非常受欢迎。