非限制性定语从句

非限制性定语从句与先行词的关系松散，只起补充说明的作用。 去除非限制性定语从句对主句的意义影响不大。非限制性定语从句由逗号隔开，在翻译成中文时，常可译成一个并列句。引导非限制性定语从句的关系代词有 which, who, whom, whose, as; 关系副词有 when 和 where。 注意非限制性定语从句不能由关系代词that引导。

1) 由which 引导的非限制性定语从句
* Her house, which was built a hundred years ago, stood still in the earthquake. 那座房子在地震中依然耸立，它是一百多年前建造的。
* This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。
* Recently I bought an ancient Chinese vase, the price of which was very reasonable. 我最近买了一个中国古代的花瓶，价格很合理。
[注] which 有时不代表一个名词， 而是代表前面整个句子或句子的一部分。
* The sun heats the earth, which makes it possible for plants to grow. 太阳给予大地热能，这样植物才有可能生长。
* He didn't pass the exam，which disappointed me. 他没通过这次考试，令我很失望

2) 由 who 引导的非限制性定语从句
* Charlie Chaplin, who died in 1977, is considered one of the greatest and funniest actors in the history of the cinema.
查理卓别林,卒于1977年，他被认为是电影史上最伟大最搞笑的演员之一。
* Charles Smith, who was my former teacher, retired last year. 查理•史密斯去年退休了，他曾经是我的老师。

3) 由 whom 引导的非限制性定语从句
* He was eager to go to the hospital to see his stepmother, whom he loved and respected as his own mother. 他急于想去医院看望他的继母,他把他的继母当作亲生母亲一样热爱和尊敬。
* Her sons, both of whom work abroad, rang her up this morning. 她的两个儿子今天早上打电话给她，他们都在国外工作。
* The eighty-nine passengers all escaped without serious injury，four of whom were Americans. 89名乘客全部脱险而没受重伤，其中有4个是美国人。

4) 由 whose 引导的非限制性定语从句
* Look at the building, whose roof is white. 看那栋楼，楼顶的颜色是白的。

5) 由 when引导的非限制性定语从句
* He will put off the picnic until May 1st, when he will be free.
他将把郊游推迟到5月1号，那时他将有空。
* At the time when I saw him, he was well. 我见到他那时，他身体还不错。

6) 由 where引导的非限制性定语从句
* They went to London，where they lived for six months.
他们去了伦敦，在那儿呆了六个月的时间。
* Some pre-school children go to a day care center, where they learn simple games and songs. 有些学龄前儿童被送到日托中心，在那他们可以学到简单的游戏和歌曲。
* They stood on the top of the building, from where they could see the whole city. 他们站在楼顶上，从那儿能看到整个城市。