Unit 8 Adventure （7） Lesson 3 Marco Polo GrammarA tip ： If winter comes, can spring be far behind ?( P. B. Shelley, British poet )冬天来了，春天还会远吗？( 英国诗人, 雪莱)Learning aim:掌握限制性定语从句与非限制性定语从句的区别Learning important﹠difficult points: as 引导的非限制性定语从句与 which 引导的非限制性定语从句的区别Learning steps:Step1.回顾定语从句的有关知识（A 级）1. 定语从句由关系代词______ _______ _______ _______ _______引导,其中______ _______ 指人，______ _______ 指物，_______ _______既可指人，又可指物，关系代词在句中可以做______ ______ ______.2. 引导定语从句的关系副词有_____ _____ _______,它们在定语从句中分别做时间，地点和原因状语。Step2.语法解析（B 级）1. 定语从句可分为限制性和非限制性定语从句。它们的区别如下：（1）形式上：非限制性定语从句用逗号和主句隔开，限制性定语从不用逗号和主句隔开。（2）意义上：限制性定语从句是句子意思不可缺少的组成部分，若去掉它，句子意思就不完整。而非限制性定语从句对先行词起补充说明作用，不是句子结构上不可缺少的部分，去掉后，句子照样成立。 She has a son who is a doctor.(不止一个儿子)【翻译】___________________ She has a son，who is a doctor（仅有一个儿子） 【翻译】___________________（3）修饰方面：限制性定语从句一般只修饰先行词，非限制性定语从句可以修饰先行词，也可以修饰其前面的整个句子或句子的一部分。She fails in the exam again, which made her mother very angry.which 在此句中指代__________.2.as 引导的限制性定语从句和非限制性定语从句。（1）在限制性定语从句中，as 多和 such 或 the same 连用，在从句中作主语或宾语。 He told me of his experience such as I had never experienced before.(as 在此句中做_____语) This is the same thing as we are in need of. (as 在此句中做____语)(2)在非限制性定语从句中，as 指代前面或后面的整个句子，在从句中作主语或宾语。 As is known to all, China is a developing country. (as 做____语) Tom was admitted into the university, as we had hoped. (as 做____语)【翻译】___...
