過去進行時由 was/were 加現(xiàn)在分詞構(gòu)成。
　　例如：
　　What were you doing this time yesterday?昨天這個時候你在做什么?
　　During the summer of 1999 she was travelling in Europe.1999年夏天她在歐洲旅行。
　　He said he was leaving for home in a day or two. 他說他一兩天之內(nèi)就動身回家了。
　　She was always thinking of others. 她老是想到別人。(贊揚)
　　She was forever complaining. 她老是抱怨。(厭煩)
　　I was reading the newspaper when the doorbell rang. 我正在看報，突然門鈴響了。
　　Jim burnt his hand when he was cooking the dinner. 吉姆做飯時把手燙了。
　　I met Diana while I was shopping this morning. 我今早買東西時碰到了戴安娜。
　　I was doing my homework while he was listening to music. 我在做作業(yè)而他在聽音樂。