过去进行时是英文语法中的一个时态，表示在过去某个时间正在进行的动作。在英文中，过去进行时通常用be动词的过去式和动词的现在分词构成。例如：“I was studying English yesterday afternoon.”（昨天下午我正在学习英语。）在书写中，为了简化表达，我们通常会使用过去进行时的缩写形式。一下是一些常用的过去进行时缩写：I was = I wasYou were = You wereHe was = He wasShe was = She wasIt was = It wasWe were = We wereThey were = They were例如：“I was studying English yesterday afternoon.” 可以缩写为：“I was studying English yesterday afternoon.”使用过去进行时的缩写形式可以让我们的英文表达更加简洁明了，但是需要注意的是，在正式的书面英文中，过度使用缩写可能会影响文章的正式度和可读性。
