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三、教学难点：
1、体会情态动词must及其否定must not 的用法，并能简单区分形容词safe,名词safety及副词safely的不同。
2、能牢记过马路的交通规则，树立安全意识。
四、教学过程：
Step 1 Pre-reading
1. Free talk: T: How do you go to school? How does your mother﹨father go to work?
S: On foot or by bike﹨bus﹨car
T: 总结 ： Every day, we walk or drive on the road.
2. Look at some pictures. (看一些行人、司机图片)
1）Look and judge. Are they right? Ss: Yes, yes, yes! ﹨No. no, no!
2）T：总结We must keep safe.﹨Road safety is very important.
3. Lead-in: T：揭题：Today we are going to talk about “.
4. T:Do you know any rules?
（让学生表达自己已有的生活经验，了解学生的语言基础。）
Ss: 学生自由说说交通规则：eg: We must look for a zebra crossing. We must look at the traffic lights.
Step 2 While-reading （Story time）
1. 学习课文第一部分。Let’s learn from the storytime.
1）Read freely
2）Try to answer with “first…,then…”
学生自读完之后用自己的语言归纳。
3） Read together
Finish the form:
Teach: green﹨red man
T: What is green man? What is red man? What do they mean?
The policeman tells us. Let’s read and act.
4）Read and act the policeman.
T: When the light is green , that means we can cross the road
When the light is red, that means we must not cross the road.
What about the yellow man?
Ss: （根据学生已有知识经验）It means “wait”