過去進(jìn)行時(shí)由be的過去式和現(xiàn)在分詞構(gòu)成，主要表示過去某個(gè)時(shí)刻(候)正在發(fā)生的動(dòng)作，常接一個(gè)表示過去的時(shí)間狀語。
What were you doing at nine last night?你昨天晚上九點(diǎn)鐘在干什么?
What were you doing when your brother watched the football game?
你哥哥看足球比賽時(shí)，你在做什么?