专题3.Unit 1 Science and Scientists第三讲Grammar and Writing【帮课堂】2022-2023学年高二英语同步精品讲义（人教2019选择性必修第二册）

第三讲Grammar and Writing ( 目标导航jing ) Grammar——表语从句 用适当的连接词填空 ①One theory was bad air caused the disease. ②Another was cholera was caused by an infection from germs in food or water. ③The truth was the water from the Broad Street pump had been infected by waste. ④What John Snow showed to the world was cholera could be overcome. ⑤What Snow was determined to find out was the 1854 outbreak of cholera in London could have caused over 500 deaths within ten days. 【自主发现】 1．在复合句中充当表语的从句称为表语从句。这种从句往往是进一步对主句的主语进行解释说明。 2．引导表语从句的连接词有连接代词that如句①、句②、句③；that引导表语从句时，仅起连接作用，无任何意义，在从句中不作任何成分，不可省略；连接副词有how，why等，如句④、句⑤。 语法知识解析 一、连接词的用法 1．that引导的表语从句。 用法：①无意义 ②不充当句子成分 ③不可省略 The trouble is that she has lost his address.麻烦的是她弄丢了他的地址。 My suggestion is that we should tell him.我的建议是我们应该告诉他。 2．whether引导的表语从句。 用法：①表“是否”的意思 ②不充当句子成分 ③不可省略 The question remains whether they will be able to help us.问题仍然是他们能否帮我们。 3．连接代词who/whom/whose/what/