广州新东方酷学酷玩夏令营：

       英语学习：过去进行时的用法：
        1）过去进行时主要表示过去某时的一个动作正在进行，过去时间可以由一个状语表示出来：
        what were you doing when i rang you up? 我给你打电话时你在干吗？
        i was having a bath (at that time). (那时)我在洗澡。
        you were then working in the post office, weren’t you? 那时你在邮局工作，对吧？
        i was writing a letter when she called. 她来时我正在写信。
        i was busy yesterday. i was preparing for the exams. 昨天我很忙，我在准备考试。
        at that moment, i wasn’t doing anything. 那会儿我什么也没做。
        i was thinking of you all those years. 那些年我一直惦记着你。
        有时候时间由上下文表示出来：
        jane was in town. she was doing some shopping. 简在城里，在买东西。
        the bride was wearing a pink dress and carrying a small bouquet. 新娘穿着粉红色的裙服，手上拿着一小束花。
        he was sitting alone on the deck. 他一个人坐在甲板上。
        someone was following her. she was scared. 有人跟着她，她很害怕。
        a small orchestra was playing. 一支小型管弦乐队在演奏。
        they knew what they were working for. 他们知道在为什么而工作。
        i didn’t know you were still waiting for me. 我不知道你还在等我。
        i asked him to tell me what was troubling him. 我让他说出他的烦心事。

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