定義：表示過(guò)去某一時(shí)刻正在進(jìn)行的動(dòng)作，或表示過(guò)去某一階段一直在進(jìn)行的動(dòng)作。如：
I was having a talk with Li Hua at that time.
那時(shí)，我正在跟李華談話。
I was watching TV at home last night.
昨晚我一直在看電視。
結(jié)構(gòu):由“was / were + 現(xiàn)在分詞”構(gòu)成。如：
I was doing my lessons then.
那時(shí)，我在做功課。
We were cleaning the house.
我們?cè)诖驋叻孔印?br> 1.時(shí)間點(diǎn)可以用介詞短語(yǔ)、副詞或從句來(lái)表示。

例如：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(yǔ)表示時(shí)間點(diǎn)）

When I saw him he was decorating his room.

當(dāng)我看見(jiàn)他的時(shí)候他正在裝飾房間。（when從句表示時(shí)間點(diǎn)）

2.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，那么主從句中的動(dòng)詞都可用過(guò)去進(jìn)行時(shí)。
例如：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）

He was cleaning his car while I was cooking.

他擦車時(shí)我正在做飯。（兩個(gè)動(dòng)作同時(shí)進(jìn)行）

通常不能用于過(guò)去進(jìn)行時(shí)的動(dòng)詞主要有：agree,be,believe,belong,care,forget,hate,have（擁有），hear,know,like,love,mean,mind,notice,own,remember,seem,suppose,understand,want,wish等。
3. 使用過(guò)去進(jìn)行時(shí)應(yīng)注意的幾點(diǎn)
①　過(guò)去進(jìn)行時(shí)可表示按計(jì)劃、安排過(guò)去某時(shí)刻將要發(fā)生的動(dòng)作。如：
He said they were leaving for Beijing this afternoon.

他說(shuō)他今天下午要去北京。

②　動(dòng)詞hope, wonder等的過(guò)去進(jìn)行時(shí)常用來(lái)表示提出要求，雖然表示現(xiàn)在的內(nèi)容，但語(yǔ)氣比一般現(xiàn)在時(shí)或一般過(guò)去時(shí)要委婉。如：
I was wondering whether you could come to join us.

我想你能否過(guò)來(lái)跟我們一起活動(dòng)?

③　過(guò)去進(jìn)行時(shí)中有always, forever, continually, constantly修飾時(shí)，表示說(shuō)話人的贊賞或厭煩的感情。如：
He was always thinking of others.

他總是想到人家。

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