bus是可数名词;
bus
n.公共汽车;巴士;(计算机系统的)总线;
v.用公共汽车运送;用校车送(学生往外区就读,使不同种族的学生一起受教育);
第三人称单数: busses buses;
复数: buses;
现在分词: bussing;
过去式: bussed;
过去分词: bused
I didn't take the first bus.
我没有乘坐首班公共汽车。
I couldn't help it if the bus was late.
公共汽车晚点了,我没办法。
You couldn't have left it on the bus, could you?
你不可能把它落在公共汽车上了吧?