過去進(jìn)行時(shí)的特殊用法

a.表示故事發(fā)生的背景

It was snowing as the medical team made its way to the front.

那支醫(yī)療小組往前線行進(jìn)時(shí)天正下著雪。

Tom slipped into the house when no one was looking.

湯姆乘沒人注意時(shí)溜進(jìn)了房間。

b.表示一個(gè)新的動(dòng)作剛剛開始

過去進(jìn)行時(shí)可用來引出一個(gè)新的動(dòng)作，這種用法頗有點(diǎn)兒像鏡頭轉(zhuǎn)換。

Five minutes later, he was standing at the door, smoking.

5分鐘后，他已站在門口抽著煙。

The baby was crying hard, and suddenly the crying stopped.

這嬰兒在大聲啼哭，突然，哭聲停止了。

c.用來陳述原因或用作借口

She went to the doctor yesterday. She was having a lot of trouble with her heart.

她昨天去看病了。她患了很嚴(yán)重的心臟病。

I haven't finished my homework because I was helping my mother at home all day yesterday.

我作業(yè)沒做完是因?yàn)槲易蛱煲恢睅蛬寢屧诩腋苫睢?/p>

d.與always, constantly等詞連用，表示感情色彩

The girl was always changing her mind.

這女孩老是改變主意。

In the past he was constantly asking me for money.

過去他總是向我要錢。

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