一般过去时和过去进行时的用法比较
<p> 1）过去进行时表示过去某个时间正在进行的动作，往往表示动作的未完成性；而一般过去时表示在过去某个时间发生的动作或存在的状态，往往表示动作已完成。试比较：</p><p> <span word="David">David</span> <span word="wrote">wrote</span> <span word="a">a</span> <span word="letter">letter</span> <span word="to">to</span> <span word="his">his</span> <span word="father">father</span> <span word="last">last</span> <span word="night">night</span>．大卫昨晚给他父亲写了一封信。（信写完了。）</p><p> <span word="David">David</span> <span word="was">was</span> <span word="writing">writing</span> <span word="a">a</span> <span word="letter">letter</span> <span word="to">to</span> <span word="his">his</span> <span word="father">father</span> <span word="last">last</span> <span word="night">night</span>．大卫昨晚正在给他父亲写信。（指信在写的过程中，不一定写完。）</p><p> 2）过去进行时和一般过去时都可表示过去某段时间内发生的动作或情况，但过去进行时侧重动作持续时间的长度；而一般过去时只说明过去某时发生某事，侧重说明事实。试比较：</p><p> <span word="It">It</span> <span word="was">was</span> <span word="raining">raining</span> <span word="heavily">heavily</span> <span word="last">last</span> <span word="night">night</span>．昨晚下着大雨。（侧重说明下雨持续时间长。）</p><p> <span word="It">It</span> <span word="rained">rained</span> <span word="heavily">heavily</span> <span word="last">last</span> <span word="night">night</span>．昨天下了大雨。（侧重说明下雨这一事实。）</p><p> 3）在带有<span word="all">all</span> <span word="night">night</span>，<span word="the">the</span> <span word="whole">whole</span> <span word="morning">morning</span>等强调时间长度的状语时，用过去进行时更好些。如：</p><p> <span word="He">He</span> <span word="was">was</span> <span word="working">working</span> <span word="all">all</span> <span word="night">night</span> <span word="last">last</span> <span word="Monday">Monday</span>．上周一他整整工作了一个晚上。</p><p> 4）用<span word="when">when</span>引导的时间状语从句中，当<span word="when">when</span>相当于<span word="while">while</span>时，用一般过去时与过去进行时无差异。如：</p><p> <span word="I">I</span> <span word="saw">saw</span> <span word="John">John</span> <span word="when">when</span> <span word="I">I</span> <span word="walked">walked</span> ／<span word="was">was</span> <span word="walking">walking</span> <span word="to">to</span> <span word="the">the</span> <span word="station">station</span>．我步行去火车站时看见了约翰。</p>
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