一般过去时表达这个动作已经做过了;过去进行时常用于过去某个精确时间下,这个动作持续进行;(常用于持续性动词)如:I was walking to school when I saw a cat in a tree.I was sleeping in the yesterday afternoon.重点就是:过去进行时的动词是可持续性的,而且在过去这个时段持续发生。所以,We were planting tree...
回答于 2022-04-12 19:01