＜正＞1.【原文】What were you doing at eight last night?昨天夜里8点你正在干什么?【解析】本句是过去进行时。它表示过去某时正在进行的动作或存在的状态。它的构成:was/were+现在分词。【拓展】它的标志词:this morning, the whole morning, all day yes原terday, from nine to ten last evening, when, while, at this time yesterday等。例:
展开▼
