本模块知识网络语法达标在Module5的基础上,进一步学习定语从句。1.非限制性定语从句非限制性定语是对先行词的附加说明,若省去也不影响主句的意思。它和主句之间用逗号隔开。非限制性定语从句不能用that引导。The Yangtze River is the third longest river in the world,which is more than 6,000 kilometres long.Sun Yat-sen,who was the leader of 1911 Revolution,first suggested the idea in 1919.限制性定语从句是用来修饰和限制先行词的,是复合句中不可缺少的组成部分。