单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,Unit 2 Ways to go to school,第二课时,crossing,What can you see at the crossing?,traffic lights,traffic lights,red light,yellow light,green light,Red light means,stop and wait.,Green light means,go.,Yellow light means,slow down and stop.,Remember the,traffic rules.,Stop and wait at a red light.,Slow down and stop at a yellow light.,Go at a green light.,(1),表示“几点钟”如；,at 7 oclock,(2),表示“进餐时间”如：,at lunch/dinner/breakfast,(3),表示一天中的某个时间点，如：,at night at noon,(4),表示某一时间点，如：,Slow down and stop at a yellow light.Stop and wait at a red light.,(5),表示地点，如：,at school,at home,at the park,等。
介词,at,的用法Role-play,Work in pairs.One student choose a traffic light,the other play the police and say the rule,then do the action.,Work in groups.One covers his eyes,another shows traffic lights.Others say the traffic rules.And then guess the traffic lights.Lets see which group is fast and correct.,比一比,Summary,Traffic rules:,Go at a green light.,Stop and wait at a red light,Slow down and stop yellow light,Homework,学生回家询问家长或上网搜查有关交通法规的资料，扩大学生对交通规则认识。