乘坐公共汽车的英语短语是 "take the bus"。
"Take" 是英语中非常常见的动词，意思是"带着"、"携带"，"the bus" 是公共汽车的意思。所以 "take the bus" 就是带着公共汽车的意思。
例句：
I'm going to take the bus to work today. (我今天要坐公交车去上班。)
She takes the bus to school every day. (她每天都坐公共汽车上学。)
Are you going to take the bus or drive? (你是坐公交车还是开车?)