限制性定语从句与非限制性定语从句一、限制性定语从句 1、形式上：不用逗号“，”与主句隔开。2、意义上：是先行词不可缺少的定语，如删除，主句则失去意义或意思表达不完整。3、译法上：译成先行词的定语：“．．．的”4、关系词的使用上：A．作宾语时可省略 B．可用 that C．可用 who 代替 whom5、限制性定语从句举例：The teacher told me that Tom was the only person that I could depend on. 老师告诉我说汤姆是我唯一的可以依靠的人。China is a country which has a long history. 中国是一个历史悠久的国家。In the street I saw a man who was from Africa. 在街上我看到一个来自非洲的人。二、非限制性定语从句1、形式上：用逗号“，”与主句隔开。2、意义上：只是对先行词的补充说明，如删除，主句仍能表达完整的意思。3、译法上：通常译成主句的并列句。4、关系词的使用上：A．不可省略 B．不用 that C．不可用 who 代替 whom5、非限制性定语从句举例 ：His mother, who loves him very much, is strict with him. 他妈妈十分地爱他对他要求很严格。China, which was founded in 1949, is becoming more and more powerful. 中国是 1949 年成立的， 现在正变得越来越强大。Last summer I visited the People’s Great Hall, in which many important meetings are held every year. 去年夏天，我参观了人民大会堂，在那儿每年都要进行许多重要会议。注意：as 和 which 引导的非限定性定语从句的比较：1）非限定性定语从句位于句未，而且 as 和 which 在从句中作主语、宾语、表语时可互换。He is a farmer, as/which is clear from his manner.This elephant is like a snake, as/which anybody can see.2）which 引导的非限定性定语从句一般放在句未，而 as 引导的非限定性定语从句可放在句未，也可放在句中、句首。 放在句首时不能用 which 替换,只能用 as。Crusoe lost his dog, which made him very sadTaiwan is part of China, as/which is known to all.As we have seen, oceans cover more than 70 percent of the earth.3）as 引导非限定性定语从句时，意为“这一点、这件事” “正如…”，常与 see， hope，expect，know，guess 等动词搭配；而 which ...
