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2. The usage of the sentences: You must ... . You mustn’t ... .
3. The comprehension of the text and the expression based on the topic: “Road safety”.
教学过程：
Step One: Preparation (Pre-reading)
Free talk
T: Hello, boys and girls, what day is it today? S: It’s Thursday.
T: And what day is it tomorrow? S: It’s Friday.
T: Yes. The weekend is coming. And what are you going to do this weekend?
S1: I’m going to stay at home and do some homework and housework.
T: You are a good boy / girl. What about you?
S2: I’m going to the park with my family.
T: Sound great. How will you go to the park?
S2: Maybe we will go there by car or on foot.
Watch the video
T: So children, every day we walk or drive on the road. Now I prepare a video for you, let’s enjoy!
T: Can you tell me what’s the video about?
S: Road safety.
T: Yes. Today’s topic is Unit 4 Road safety. (揭示课题，新授Teach: road safety)
T: Let’s know today’s aims. Let’s read together.
Students read the aims of this lesson.
T: After this lesson, I hope you can finish these aims well. Come on!
Look and say
T: boys and girls, do you remember some signs about road safety?
Students try to say some signs（学生活动）
T: very good. Now I will show you some signs and please tell me what do these signs mean？OK？
T: When we talk about this topic, we can use the sentences:
It means you must/ mustn’t... (新授Teach: must & mustn’t)
Students say talk about the signs.
learn new words
T:Good job! Boys and girls, you know so many signs now. Today, let’s learn more signs, OK?