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教前准备：PPT、练习纸
Step 1 Free talk
1 Greeting
T:Good morning, class.
Ss:Good morning, Miss Yuan.
T:Sit down,please.
Ss:Thank you.
T:Today we’ll talk about how to protect the Earth. First let’s play a game. See the phrase, read loudly. See the picture, clap your hands.
2 Play a game PPT出示本单元的重要短语，如：save energy，paper bags，cut down too many trees，学生大声读出所看到的短语。
Step 2 Presentation
1Look and think (PPT呈现地球的图片)
T:This is our Earth. It was beautiful many years ago.
(然后PPT呈现水枯竭，树木被伐光等地球被破坏的图片)
T:But now it’s like this. There is no water. There are no trees. There is too much plastic.（引导学生回答）
T: The Earth is crying. So we should protect the Earth. Look, “Environmental guard” needed.
(课件呈现“环保小卫士”的图片)
T: You must finish three tasks.
2.复习use...to句型
Task1(课件出示Task1的过关条件)
T:Let’s finish Task1. We know water, energy and trees are very useful. What do you use them to do?
学生根据图片提示操练句型...is useful. We use...to...
给出例子：Water is useful. We use water to clean things.
同法练习wood，plastic
T:What about wood and plastic? What does wood come from?
Ss:It comes from trees.
T:What do you use wood to do?
Ss:...
T:What do you use plastic to do?
Ss:...
T:Yes, very good. Plastic is useful. Can we use too much plastic?