过去进行时是什么结构 过去进行时的结构，定义是什么？
\u8fc7\u53bb\u8fdb\u884c\u65f6\u548c\u8fc7\u53bb\u5b8c\u6210\u8fdb\u884c\u65f6\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f\u8fc7\u53bb\u8fdb\u884c\u65f6\u662f\u8868\u793a\u8fc7\u53bb\u7684\u67d0\u4e2a\u5177\u4f53\u65f6\u95f4\u53d1\u751f\u7684\u52a8\u4f5c,\u6bd4\u5982
I was wathcing TV at three yesterday afternoon.\u6628\u5929\u4e0b\u5348\u4e09\u70b9\u6211\u5728\u770b\u7535\u89c6
\u8fc7\u53bb\u5b8c\u6210\u65f6\u8868\u793a\u53d1\u751f\u52a8\u4f5c\u53d1\u751f\u5728 \u201c\u8fc7\u53bb\u7684\u8fc7\u53bb\u201d,\u6bd4\u5982
He had lived in Shanghai for 3 years before he came to Beijing \u5728\u6765\u5317\u4eac\u4e4b\u524d,\u4ed6\u5728\u4e0a\u6d77\u4f4f\u4e86\u4e09\u5e74.
\u6765\u5317\u4eac \u5df2\u7ecf\u662f\u53d1\u751f\u5728\u8fc7\u53bb\u7684\u52a8\u4f5c \u5728\u4e0a\u6d77\u5c45\u4f4f\u53d1\u751f\u5728\u6765\u5317\u4eac\u4e4b\u524d,\u6240\u4ee5\u662f\u53d1\u751f\u5728\u8fc7\u53bb\u7684\u8fc7\u53bb,\u53e5\u5b50\u4f7f\u7528\u8fc7\u53bb\u5b8c\u6210\u5f0f \u7531 had+\u52a8\u8bcd\u7684\u8fc7\u53bb\u5206\u8bcd \u6784\u6210\u3002
过去进行时，是表示过去某个具体时刻正在进行的事情或动作。
（二）结构
was/were +doing （现在分词）
（三）用法
1、过去进行时表示过去某段时间内持续进行的动作或者事情。常用的时间状语this morning， the whole morning， all day yesterday， from nine to ten last evening， when， while例如：
We were watching TV from seven to nine last night.
昨天晚上七点到九点的时候我们在看电视。
What was he researching all day last Sunday？
上周日他一整天都在研究什么？
My brother fell while he was riding his bicycle and hurt himself.
我哥哥骑自行车的时候从车上摔下来，受伤了。
It was raining when they left the station.
他们离开车站的时候天正在下雨。
满意请采纳 谢谢
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