表示過(guò)去進(jìn)行時(shí)態(tài),即過(guò)去的某個(gè)時(shí)間段正在發(fā)生的動(dòng)作.He was doing his homework this time last night.昨晚此時(shí),他在做家庭作業(yè).We were singing an English song when a man entered the room.我們正在唱一支英文...那做過(guò)去將來(lái)時(shí)呢would + 動(dòng)詞原形表示過(guò)去將來(lái)。was/were+現(xiàn)在分詞，在什么時(shí)候用表示過(guò)去進(jìn)行時(shí)態(tài)，即過(guò)去的某個(gè)時(shí)間段正在發(fā)生的動(dòng)作。