文档介绍：过去进行时
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一、定义
过去进行时表示在过去某一时刻或某一段时间内进行或发生的动作，不一定已完成。其形式为was /were + V-ing。
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二、过去进行时的用法
（正在）进行的动作。
I was watching TV at 7 last night.
I was sleeping when it started to rain.
*。
At that time,I was working in Sydney.
，另一动作同时突然发生。 (1)用while连接（while只接doing,用延续性动词） (2）when表示（when可以接doing或did，动词可以是延续性的也可是短暂性的，when后动作时间长，用doing，时间短，用did）
I was watching TV when someone knocked at the door.
Someone knocked the door while/when I was watching TV.
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思考：“I was walking past the car while it suddenly exploded.(爆炸)”正确与否？
，以提供其时间背景
Mary was dancing，but she stopped when she saw me.
When I was working in the garden ,the accident happened.
*，使描述生动。
She was always helping others when she lived here.
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三、过去进行时的用法常用的时间状语
at that moment, at ten o’clock last night ,(at) this time of last year, last night, all day yesterday, this morning, the whole morning, from nine to ten last evening, when, while等。
. I _________(read) a newspaper at 7 last night.
He ________(clean) the yard when his son came home.
They ________(play) very hard at this time of last year.
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四、与一般过去时的对比
都强调过去发生的事 但用一般过去时，只是表示有过这件事（已做完）；用过去进行时，则强调了动作的连续性（未必已完成）。
. I was reading a book that 。（未读完）
I read a book that evening. 那天晚上我读了一本书。（已读完）
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练****br/>1.（04中考） Someone __ at