2.过去进行时的结构
过去进行时由“was / were +现在分词”构成。如： I was doing my lessons then.那时，我在做功课。 We were cleaning the house.我们在打扫房子。 3.使用过去进行时应注意的几点
(1)过去进行时可表示按计划、安排过去某时刻将要发生的动作。如： He said they were leaving for Beijing this afternoon.他说他今天下午要去北京。
(2)动词hope, wonder等的过去进行时常用来表示提出要求，虽然表示现在的内容，但语气比一般现在时或一般过去时要委婉。如：
I was wondering whether you could come to join us.我想你能否过来跟我们一起活动(3)过去进行时中有always, forever, continually, constantly修饰时，表示说话人的赞赏或厌烦的感情。如：
He was always thinking of others.他总是想到人家。 4.过去进行时与一般过去时的区别
(1)过去进行时强调动作在过去某时刻正在进行或持续，而一般过去时表示动作的完成。如：He was writing his composition last night.他昨晚在写作文。(不一定写完)
He wrote his composition last night.他昨晚写了一篇作文。(已经写完) (2)表示过去的状态、感觉及心理活动的静态动词(如be, like, love, hate, fear, own, hear, see,know, want, notice)可用于一般过去时，但通常不用于进行时。如：
I hated it when a man spoke with his mouth full of food.我讨厌人们说话时口里含着食物。
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(3)一般过去时与always, constantly, forever, continually等连用，表示“过去经常性、习惯性的动作”;而过去进行时与always, constantly, forever, continually等连用，表示动作的重复，常带有感情色彩。如：
He always got up at six.他过去总是六点起床。
He was always thinking of his work.他总是一心想到工作。
(4)有时过去进行时可以用来替换一般过去时，但一般过去时表示主语的行为是经过认真考虑的;而过去进行时表示一种较随便或没有进行仔细考虑的行为。如：
I thought that he would agree with us.我原以为它会同意我们的。I was thinking of persuading him to follow my advice.我想到了要说服他接受我们的建议。
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