初中英语语法：过去进行时
<p> 一、过去进行的构成与用法</p><p> 前面讲到，现在进行时由<span word="am">am</span> / <span word="is">is</span> /<span word="are">are</span>+现在分词构成。如果我们将现在进行时中的助动词<span word="am">am</span> / <span word="is">is</span> / <span word="are">are</span>改为过去式<span word="was">was</span> / <span word="were">were</span>，那么现在进行时就变成了过去进行时，也就是说过去进行时由<span word="was">was</span> / <span word="were">were</span> + 现在分词构成。如：</p><p> <span word="He">He</span> <span word="fell">fell</span> <span word="asleep">asleep</span> <span word="when">when</span> <span word="he">he</span> <span word="was">was</span> <span word="reading">reading</span>. 他看书时睡着了。</p><p> <span word="We">We</span> <span word="were">were</span> <span word="expecting">expecting</span> <span word="you">you</span> <span word="yesterday">yesterday</span>. 我们昨天一直在等你。</p><p> 第一句中的看书用了过去进行时，是因为当时看书的动作正在进行;第二句中的等也用了过去进行时，也是因为等这个动作昨天一直在持续。</p><p> 二、过去进行的重要用法补充</p><p> 1. 表示临时性</p><p> 即表示在过去短期内正在进行的动作或存在的临时情况，这种情况通常不会长期如此。如：</p><p> <span word="It">It</span> <span word="happened">happened</span> <span word="while">while</span> <span word="I">I</span> <span word="was">was</span> <span word="living">living</span> <span word="in">in</span> <span word="Paris">Paris</span> <span word="last">last</span> <span word="year">year</span>. 这件事发生于去年我住在巴黎的时候。</p><p> 2. 表示计划</p><p> 即表示为过去的将来计划或安排好的活动。这类用法在没有明确上下文的情况下，通常会连用一个表示将来时间的状语。如：</p><p> <span word="He">He</span> <span word="said">said</span> <span word="that">that</span> <span word="his">his</span> <span word="sister">sister</span> <span word="was">was</span> <span word="getting">getting</span> <span word="married">married</span> <span word="next">next</span> <span word="December">December</span>. 他说他妹妹12月结婚。</p><p> 用<span word="arrive">arrive</span>, <span word="come">come</span>, <span word="go">go</span>, <span word="leave">leave</span>, <span word="take">take</span> <span word="off">off</span>等动词的现在进行时描写行程安排，也通常有含有将来意义。如：</p>
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