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重点：能听懂、会说、认读新单词Tree Planting Day, air, place, plant trees, keep the air clean, keep us cool, make the place beautiful
难点:Trees can……句型的运用。
四、教学准备 :课件, CAI, Drawing Instrument
五、教学方法:导入法,多媒体教学,任务型教学法、讲授法
六、教学过程
Step 1 Warm-up
1 Greetings
2 free talk
(1)What’s the weather like today?
(2)Is it spring now/ Is it hot in spring?
Step 2 Presentation
1、New words
展示两张图片，一张树木成林，风景如画；一张工厂林立，浓烟滚滚，没有树木。
T: What can you see in picture 1/picture2?
Ss: I can see……
T: Which picture do you like? Why?
Ss: ……
T: Do you like trees?
Ss: ……
T: What can trees do?
keep the air clean
T: Is the air clean in picture 1/picture 2?
T: Why?
S1: There are many trees in picture 1.
T: You are so clever! Yes! There are many trees in picture 1. So, what can trees do?
T: Yes, trees can keep the air clean.
操练词组并板书，然后引导学生说出Trees can keep the air clean.这一句子，然后板书，操练。
keep us cool
T: Trees are very important for us. What else can trees do for us?
Show picture to teach the new word keep us cool