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必修三《Unit 8 Protecting the Environment Section 3： GRAMMAR MAKES SENSE》优秀教案
教学内容分析：该句型放在保护环境这个单元，所以围绕单元话题设计了free talk，句子改写，阅读并回答问题等活动，让学生熟悉强调句型并能增强环境保护的意识。
教学环节与活动：
引入
结合单元话题提问：What has caused global warming?
观察发现
针对问题呈现以下答案，让学生总结句子特点。
... 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.
讲与练
（1）强调句型的基本结构及用法
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
被强调部分可以是句子的主语、宾语、补语、状语。
（2）强调句型的时态
如果原句中谓语动词使用的是现在或将来时间范畴的时态（一般现在时、现在进行时、现在完成/现在完成进行时、一般将来时、将来进行时、将来完成时等），用It is…that…。
如果原句中谓语动词为过去时间范畴的时态（一般过去时、过去进行时、过去完成时、过去将来时等），则用It was…that…。
练习一、将句子的画线部分用强调句型改写。
Scientists warned that greenhouse gases would warm the earth by trapping heat energy in the atmosphere.
The greenhouse effect gives the earth’s surface the average temperature of 15℃.
Much of the energy used to light and heat our homes comes from fossil fuels.
The developed countries consume the most energy in the world.
Carbon dioxide has the tendency to stay in the atmosphere for centuries while other greenhouse gases stay in the atmosphere only for a day or less.
Environmentalists have tried to stop the earth’s temperature rising.
Scientists want to find out about future climate changes and their effects on our environment.
In the years ahead, the level of the sea could rise by several meters because of global warming.