一、過去進(jìn)行時(shí)除了可以表示過去某段時(shí)間發(fā)生的事情外，也可以表示在過去某個(gè)時(shí)間點(diǎn)發(fā)生的事情，時(shí)間點(diǎn)可以用介詞短語、副詞或從句來表示。例如：
1. What was she doing at nine o'clock yesterday？
昨天晚上九點(diǎn)她在做什么？（介詞短語表示時(shí)間點(diǎn)）
2.Tom was getting up at six o’clock every day that week.
湯姆那一周里每天都是六點(diǎn)鐘起床。
3.I was washing my clothes at this time yesterday．
昨天的這個(gè)時(shí)候，我正在洗衣服。
4.They were playing games at 5：00 p.m. yesterday．
昨天下午五點(diǎn)他們正在玩游戲。
5. What were you doing in the classroom yesterday afternoon?
昨天下午你在教室里干什么?
6. When I saw him he was decorating his room.
當(dāng)我看見他的時(shí)候他正在裝飾房間。（when從句表示時(shí)間點(diǎn)）

二、在復(fù)合句中，如果主要?jiǎng)幼骱捅尘皠?dòng)作都是延續(xù)的或同時(shí)發(fā)生的，那么主從句的動(dòng)詞都可用過去進(jìn)行時(shí)。例如：
1. While he was waiting for the bus，he was reading a newspaper.
他邊等車邊看報(bào)。（兩個(gè)動(dòng)作都是延續(xù)的）
2.He was cleaning his car while I was cooking.
他擦車時(shí)我在做飯。（兩個(gè)動(dòng)作同時(shí)進(jìn)行）
3.They were singing while we were dancing.
我們跳舞的時(shí)候他們正在唱歌。
4.When I was doing my homework,my mother was cooking.
當(dāng)我正在做功課的時(shí)候，我媽媽正在做飯。
5.When my mother was doing the housework,my father was watching TV.
當(dāng)我媽媽正在做家務(wù)的時(shí)候，我爸爸正在看電視。