as i was getting on the bus ,i slipped and hurt my foot 这句话为什么用过去进行时,get on是瞬间动词
问题描述：
as i was getting on the bus ,i slipped and hurt my foot 这句话为什么用过去进行时,get on是瞬间动词
答
因为滑倒和脚受伤是在上车的过程当中发生的,是一直在进行的状态