我们用过去完成进行时态来形容一个在过去开始的行动,这个行动持续到过去的另一个时间。
We use the past perfect continuous tense to show that an action started in the past and continued up until another time in the past .
我过去一直在跑是过去进行时态的一个例句。
` I had been running ' is an example of the past progressive .