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必修三英语《Unit 8 Protecting the Environment Section 3： GRAMMAR MAKES SENSE》精品课课件
The burning of fossil fuels has resulted in the increase of carbon dioxide.
Who made accurate measurements of the amounts of carbon dioxide in the atmosphere from 1957 to 1997?
Charles Keeling made accurate measurements of the amounts of carbon dioxide in the atmosphere from 1957 to 1997.
What do they have in common?
... it is human activity that has caused this global warming rather than a random but natural phenonmenon.
... it is the burning of fossil fuels that has resulted in the increase of carbon dioxide.
It was a scientist called Charles Keeling who made accurate measurements of the amounts of carbon dioxide in the atmosphere from 1957 to 1997.
sum up：
It is(was)+ 被强调部分
+ that/who +剩余成分
-------强调句型
Eg: We elected him monitor at the class meeting yesterday. 主 宾 宾补 地状 时状
强调句型是英语中的一种重要的句子结构，它可以强调除谓语以外的其它成分，是英语学习者必须掌握的一种重点句型，因而在高考英语试卷上占有一席之地。现对强调句型的各个主要方面作以归纳。
例句：我们昨天在班会上选举他为班长。
It was we that /who elected him monitor at the class meeting yesterday. （强调主语）
It was him that /whom we elected monitor at the class meeting yesterday. （强调宾语）
It was monitor that we elected him at the class meeting yesterday. （强调宾补）
It was at the class meeting that we elected him monitor yesterday. （强调地点状语）
一、基本结构：
1. It is(was)+ 被强调部分+ that（强调部分是人时也可用who/whom） +其他成分
Eg: We elected him monitor at the class meeting yesterday. 主 宾 宾补 地状 时状
Practice 1: Rewrite each sentence with It is/was…that/who… (Ex.2 on P29)
Scientists warned that greenhouse gases would warm the earth by trapping heat energy in the atmosphere.
It was scientists who warned that greenhouse gases would warm the earth by trapping heat energy in the atmosphere.
2. The greenhouse effect gives the earth’s surface the average temperature of 15℃.