過去進行時的特殊用法

a.表示故事發生的背景

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

那支醫療小組往前線行進時天正下著雪。

Tom slipped into the house when no one was looking.

湯姆乘沒人注意時溜進了房間。

b.表示一個新的動作剛剛開始

過去進行時可用來引出一個新的動作，這種用法頗有點兒像鏡頭轉換。

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.

我作業沒做完是因為我昨天一直幫媽媽在家干活。

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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