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基本句型：We’re trying to save the earth!
The river used to be so clean.
The air is badly polluted.
No scientific studies have showed that shark fins are good for health.
We should help save the sharks.
2. 技能目标: 能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
3. 情感目标: 有环境危机意识，学会关注环境保护环境。二、教学重难点：
二、教学重点
（1）能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
（2）保护环境的措施方法。
三、教学难点
能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
四、教学过程
I. Revision
(1) Role-play 2d.
(2) Review the words and phrases.
II. Lead in
(1) Teacher tells students the earth is badly polluted. Look at the pictures and say out what happened. so what should we do to save the earth? Let’s take action. For example:
Air pollution
1. Factories pour dangerous gases into the air. Factories produce too much dangerous smoke.
2. Cars also pour dangerous gases into the air. The traffic produces too many fumes.
3. Some people smoke in public places
Natural resources
Natural resources are disappearing at a dangerous rate.
Water pollution
The water is very dirty. Fish died.
(2) We are harming our planet in so many ways. What should we do?
close down the factories;
help to clean up the river;
take the bus or subway;