Unit 2 Ways to go to school.
on foot步行
by 经，乘
bus公共汽车
plane飞机
taxi出租车
ship大船
subway地铁
slow down减速
train火车
stop停，停车站
foot脚
traffic交通
traffic lights交通信号灯 bike自行车
fast快的
ferry轮渡
sled雪橇
must必须
交通方式：
on foot步行
by bus乘公共汽车
by bike骑自行车
by plane乘飞机
by taxi坐出租车
by ship乘轮船
by subway坐地铁
by sled坐雪橇
by ferry轮渡
Stop and wait at a red light
.红灯停下等待。
Slow down and stop at a yellow light.黄灯减速停下。
Go at a green light.绿灯行。