Section Ⅲ　Grammar--非限制性定语从句&定语从句的省略

语 境 自 主 领 悟 先观察原句 后自主感悟 1.The Great Wall of China is the longest man­made structure (which was)ever built in the world.

2.The Three Gorges Dam，which is the biggest construction project in China since the building of the Great Wall and the Grand Canal，has been built to control flooding and provide hydro­electric power for the central region of China.

3.Sun Yat­sen，who was the leader of the 1911 Revolution，first suggested the idea of a dam across the Yangtze River in 1919. 1.2、3句中，关系词前面均有逗号，它们为非限制性定语从句。

2.1句中的定语从句可转换为过去分词短语。

　　一、非限制性定语从句

　　非限制性定语从句用来对先行词作补充说明。没有它，主句也能独立存在；非限制性定语从句和主句的关系不密切，它与先行词之间常用逗号隔开。需注意的是，that不能引导非限制性定语从句。

　　1．关系代词引导的非限制性定语从句

　　(1)which指物，在定语从句中作主语或宾语。

　　China Daily attracts a worldwide readership，which shows that more and more people all over the world want to learn about China.

　　《中国日报》有着全球的读者群，这说明全球越来越多的人想要了解中国。

　　(2)who指人，在定语从句中作主语或宾语。

　　Li Hua，who is our monitor，was praised by our teacher yesterday.

李华是我们的班长，昨天被我们的老师表扬了。