04 Unit 2 Language and Mind 主语从句和表语从句（课件）英语沪外版2020选择性必修第二册

Unit 2 Language and Mind Subject clauses and predicative clauses 主语从句和表语从句 主语从句：在句子中担当主语的是一个从句，这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 表语从句：表语从句在复合句中作主语的表语。表语从句和主语指同一内容，它是对主语进行解释，说明；使主语的内容具体化。 一般结构是“主语+系动词+表语从句”。 主从句时态呼应一致原则， 用陈述语序。 Introduction of the Terms Introduction of the Rules --- Subject clauses Introduction of the Rules --- Subject clauses 1. 主语从句位于句首 What he wanted to say was what you wanted to know. 2. 由 it 做形式主语，将从句后置。 It is believed that people who eat vegetables every day are healthier than those who don't eat vegetables. Introduction of the Rules --- Subject clauses Introduction of the Rules --- Subject clauses 1. 从属连词 that 引导的主语从句: 从句作主语, 谓语动词用单数形式。 that 引导的从句是一个完整的陈述句, 从句内容为确定的事实, 真理, that 不做任何成分, 无意义。 注：that 位于句首不可以省略，位于句中可省。 e.g. That the earth moves around the sun is known to all. Introduction of the Rules --- Subject clauses 1. 从属连词 whether, if 引导的主语从句： e.g. It is unknown whether/ if he has agreed to my plan. Introduction of the Rules --- Subject clauses 2. 连接代词 连接代词引导的从句是不完整的陈述句，连接代词在从句中作一定的成分。 连接代词在从句中作主语、宾语、表语或定语。 注：当从句为：what+be+表语时，be 动词的单复数取决于其后的表语。 e.g. Which subway we should take is the first problem we have to solve. Introduction of the Rules --- Subject clauses 3. 连接副词 连接副词引导的从句是完整的陈述句。 连接副词在从句中作状语成分。 e.g. Why they suddenly disappeared still remains a mystery. Where we shall have our meeting is not your business. Choices：主语从句 l.________ as much as one-fifth of all timber harvested is not used. A. The estimate B. The estimate C. They are estimated D. It is estimated that 2.________ was once regarded as impossible has now become a reality. A. That B. Which C. Who D. What 3. _______we have achieved is attributed to the guidance of our parents. A. Whoever B. Whatever C. However D. That D D B Introduction of the Rules --- predicative clauses 1. 从属连词