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三、Past perfect continuous 过去进行时

强调某个过去时间之前发生较长时间段内进行的动作。

She was rescued by a man who had been working in a nearby garage.

过去某个确定时间点内反复进行的动作。

We had only been driving for about fifteen minutes when Jill asked me to stop the car.

过去某个时间点还在进行的动作。

I’d been waiting for the train for over an hour when they announced that it had been cancelled.

四、进行时态和非进行时态

在下列情况下使用进行时态。

1)动作还没有完成：The doctor was writing a note.

2)活动是暂时的而不是永久的。You’re breathing quite heavily.

3)较长时间内的反复进行的二不是一次发生的动作。

The man was looking at his watch.

下列动词不能用于进行时：know，like, understand, belong, resemble, realize.

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