论文部分内容阅读
一、过去进行时的构成1.过去进行时由"助动词was/were+现在分词"构成。例如:When I was watering the flowers in the garden,it began to rain.我正在花园里浇花时,天开始下起雨来。We were having supper when the phone rang.我们正在吃晚饭时电话响了。