2018--2019学年人教版模块六Unit 4 Global warming Grammar学案
2018--2019学年人教版模块六Unit 4 Global warming Grammar学案第1页

Unit 4 Global warming Grammar

it的用法(2)学案

  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.