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3. 句子重音的理解和尝试运用。
教学过程：
Step1: warm-up
1. Greeting.
2. sing a song: traffic lights song
Twinkle, twinkle, traffic light.
Round the corner shining bright.
Red man, stop!
Green man, go!
Yellow man, very very slow!
Twinkle, twinkle, traffic light.
Round the corner shining bright.
3. Think and talk
T: I will give you 4 scenes, you need to use “We can …/ We can’t …/ We must …/ We mustn’t …” to make sentences.
(1) We can/can’t … on the road.
(2) We can/can’t … in the school.
(3) We must/mustn’t … in the park.
(4) We must/mustn’t … on the bus.
Step2: presentation
1. Sound time
T: Look, Bobby and Tina want to cross the road. Let’s hear what they say.
T: What does Bobby say?
S: There are no cars on the road. Let’s run.
T: Can Bobby run now? if you are the policeman, what will you say?
S: …
T: Here is a policeman, he says something to Bobby and Tina. Let’s have a look.
Stop! There’s a ‘red man.
We ‘mustn’t walk now.
We must ‘wait for the ‘green man.
‘There he is! ‘Now we can walk,