你问的混在一起了有过去进行时【was/were+V-ing】，如 Tom was playing basketball yesterday afternoon.
昨天下午，汤姆在打篮球。有过去完成时【had+P.P】，如 The train had left when I got to the train station.
当我昨天到达火车站的时候，火车已经开走了。
（强调对当时的影响，即没法坐火车导致的结果）有过去将来时【was/were going to ; would】，如 David said he would kill the little sheep if there
was no more food.
大卫说，如果没有更多食物的话，他会杀了那只小羊。
