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来源：网络资源 2023-01-12 17:52:18
过去进行时的特殊用法
a.表示故事发生的背景
It was snowing as the medical team made its way to the front.
那支医疗小组往前线行进时天正下着雪。
Tom slipped into the house when no one was looking.
汤姆乘没人注意时溜进了房间。
b.表示一个新的动作刚刚开始
过去进行时可用来引出一个新的动作，这种用法颇有点儿像镜头转换。
Five minutes later, he was standing at the door, smoking.
5分钟后，他已站在门口抽着烟。
The baby was crying hard, and suddenly the crying stopped.
这婴儿在大声啼哭，突然，哭声停止了。
c.用来陈述原因或用作借口
She went to the doctor yesterday. She was having a lot of trouble with her heart.
她昨天去看病了。她患了很严重的心脏病。
I haven't finished my homework because I was helping my mother at home all day yesterday.
我作业没做完是因为我昨天一直帮妈妈在家干活。
d.与always, constantly等词连用，表示感情色彩
The girl was always changing her mind.
这女孩老是改变主意。
In the past he was constantly asking me for money.
过去他总是向我要钱。
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