Unit 4 Global warming Section Ⅲ Grammar-it 的用法（2）语法图解探究发现①There is no doubt that the earth is becoming warmer and that it ishuman activity that has caused this global warming rather than a random but natural phenomenon.②It was a scientist called Charles Keeling, whomade accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997.③They also agree thatit is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide.④It was during the 20th century that the temperature of the earth went up about one degree Fahrenheit.[我的发现]这些句子都是强调句，句中的黑体词部分标出了句中的强调句结构，即：it_is/was＋被强调部分＋that/who ...句首词用“it”；be 动词总是用单数形式，即 is 或 was。连接词一般用 that，当强调部分是人时，强调连接词也可用 who。一、强调句的基本用法强调句就是把句中要强调的部分(通常是主语、宾语、状语或状语从句)放在 It is/was和 that/who 之间，原句中剩余部分放在 that/who 之后。1．强调句的陈述句式“It is/was＋被强调部分＋that/who＋其他剩余部分．”The 2022 Winter Olympic Games will take place in Beijing and Zhangjiakou.→It is in Beijing and Zhangjiakou that the 2022 Winter Olympic Games will take place.在北京和张家口将要举行 2022 年冬季奥运会。[名师点津] (1)强调句中的连接词只用 that(指人或物)或 who(只指人)，且都不可省略。(2)强调句可以强调主语、宾语和状语，但不能强调谓语，强调谓语动词要用 do/does/did＋动词原形。1He did write to you last week. 上周他确实给你写了信。2．强调句的一般疑问句式“Is/Was it＋被强调部分＋that/who＋其他剩余部分？”Is it in Beijing and Zhangjiakou that the 2022 Winter Olympic Games will take place?是在北京和张家口将要举行 2022 年冬季奥运会吗？3．强调句的特殊疑问句式“被强调的疑问词＋is/was it＋that＋其他剩余部分？”What's it that Professor Liu teaches us this year?刘教授今年到底教我们什么？...
