非限制性定语从句一、与限制性定语从句的区别：限制性定语从句是不能去掉的，否则剩下的部分就失去意义而不能成立。
非限制性定语从句则不然，它只对所修饰的词作进一步的说明，去掉之后并不影响整个句子的含义。
在形式上，非限制性定语从句与主句之间通常必须有逗号隔开。
试比较：①A man who doesn’t want to learn from others can’t achieve much.②I come from China, which has a long history of 3000 years.二、as和which的区别翻译下列句子，然后找出每句的先行词。
1. A five-year-old boy can speak two foreign languages, which surprises me.2.The weather turned out to be very good, which was more than we could expect.3.Tom is tall, as are his brothers.4.As we all know, paper was first made in China.归纳：as和which在非限制性定语从句中可代替整个主句。
as可用在固定搭配中as anybody can see正如人人都能看到的那样as has been said before如前所说as often happens 正如经常发生的那样as has been pointed out 正如已指出的as we all known/ as is well known to us众所周知as mentioned above如上所述1.___________ often happens, he is late again.2.He came here very late, ____________ was unexpected.3.He has passed the text, ___________ nobody knows.4.Tom has made rapid progress, ____________ makes me very happy.5.Mother was terrified, ____________ I could see from her eyes.6.Our team lost the game, ____________ was reported in the newspaper. 巩固练习：一、完成句子。
1.射击最初只是生存工具，19世纪末才发展成为一项体育运动。
Shooting, _________was a means of survival originally, developed into a sport only in the late 19th century.2.中国吸烟人数：约3.5亿；分布：男性75％;女性：25％Currently China has about 350 million smokers, among _________75% are men and 25% are women.3.受二手烟影响人数：约5.4亿；因二手烟死亡人数：超过10万/年Around 540 million people are affected by second-hand smoke, ________causes 100,000 deaths per year.4.众所周知，2008年北京将举办奥运会。
英语作为一种国际语言，将会在交流中起着重要作用。
作为一名高三学生，我们应抓住现在的学习机会努力学好它。
只有这样，才能为奥运贡献自己的力量。
_________ is known to all, Beijing will host the 2008 Olympic Games. English, __________ is an international（国际的）language, plays an important part in communicating（沟通、交流）with foreigners. We Senior Three students should catch this opportunity（机会）to learn it well, by __________ we can make our contribution （贡献）to the Olympic Games.二、英译汉。
1.Don’t cheat me. I’m no longer the boy that I was three years ago.______________________________________________________________________ 2.There is no difficulty that cannot be overcome.______________________________________________________________________3.Pollution is a pressing problem which we must deal with（解决、处理）.______________________________________________________________________ 4.I want to make some friends from whom I can learn a lot.______________________________________________________________________ 5.She has two sons who are doctors.______________________________________________________________________ 6.She has two sons, who are doctors.______________________________________________________________________ 7.They quarreled（吵架）everyday, which led to their divorce（离婚）.______________________________________________________________________ 8.We will send the boy to Britain, where he can receive better education.______________________________________________________________________ 9.She was very patient towards the children, which her husband seldom was.______________________________________________________________________ 10.After graduation, I decided to stay in Guangzhou, where I spent my college life．______________________________________________________________________ 11.Lu Xun, whose real name is Zhou Shuren, wrote many novels and proses（散文）in his whole life .______________________________________________________________________ 12.China, which lies in the east of the Asian and on the west of the Pacific Ocean（太平洋）, covers an area of about 960 square kilometers with a large population（人口）of 1.37 billion.______________________________________________________________________ ______________________________________________________________________ 13.Born on the 18th of January, 1979 in Taiwan, Jay Chow was raised by his motherand was shy and quiet during his childhood.______________________________________________________________________ ______________________________________________________________________三、汉译英。
1.有什么我可以为你做的么？______________________________________________________________________ 2.不要读那些你看不懂的书。
______________________________________________________________________ 3.我永远都不会忘记我们在高中学习的那段时光。
______________________________________________________________________ 4.不努力学习的学生不会通过考试的。
______________________________________________________________________ 5.他父亲在他出生那年逝世了。
______________________________________________________________________ 6.这是我们上个月买的那幢房子。