1. 過去進(jìn)行時(shí)表示過去某段時(shí)間內(nèi)持續(xù)進(jìn)行的動(dòng)作或者事情。

常用的時(shí)間狀語(yǔ)this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while等。例如：

We were watching TV from seven to nine last night.

昨天晚上七點(diǎn)到九點(diǎn)的時(shí)候我們?cè)诳措娨暋?/p>

What was he researching all day last Sunday?

上周日他一整天都在研究什么?

My brother fell and hurt himself while he was riding his bicycle.

我哥哥騎自行車的時(shí)候從車上摔下來(lái)，受傷了。

It was raining when they left the station.

他們離開車站的時(shí)候天正在下雨。

When I got to the top of the mountain, the sun was shining.

當(dāng)我到達(dá)山頂?shù)臅r(shí)候，陽(yáng)光燦爛。

2. 過去進(jìn)行時(shí)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(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))

She was doing her homework then.

那個(gè)時(shí)候她正在寫作業(yè)。(副詞表示時(shí)間點(diǎn))

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))

3. 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)。

When 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)我在做飯。(兩個(gè)動(dòng)作同時(shí)進(jìn)行)

【典型例題】

1) Mary ___ a dress when she cut her finger.

A. made

B. is making

C. was making

D. makes

答案C. 割傷手指是已發(fā)生的事情，應(yīng)用過去時(shí)。同時(shí)，when表時(shí)間的同時(shí)性，“瑪麗在做衣服時(shí)”提供事情發(fā)生的背景，因此用過去進(jìn)行時(shí)。

2) As she ___ the newspaper, Granny ___ asleep.

A. read; was falling

B. was reading; fell

C. was reading; was falling

D. read;fell

答案B.句中的as = when, while，意為"當(dāng)……之時(shí)"。描述一件事發(fā)生的背景時(shí)，用過去進(jìn)行;一個(gè)長(zhǎng)動(dòng)作發(fā)生的時(shí)候，另一個(gè)短動(dòng)作發(fā)生。句意為 "在她看報(bào)紙時(shí)，奶奶睡著了。"句中的 fell (fall的過去時(shí))，是系動(dòng)詞，后跟形容詞，如：fall sick。

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