Unit 4,Road safety,Introduce,T: How can you cross the road safety? S：We must look for a zebra crossing. We must look at the traffic lights and wait for the green man. See the red man, we mustnt cross the road. You can wait on the pavement. You mustnt play on the road. T: Well done. Now lets play a game,Words,look lk,动词，和at构成固定词组：look at,意为“看.” eg：He is looking at the boys over there.他正在看那边的男孩。 小练习：填上合适的介词： To keep safe, you can look _for cars and blkes,out,Words,can kn,情态动词 ，表示：“会、能.后跟动词原形
