语法总结之过去完成体的用法
<p>过去完成体用法的总结：</p><p>完成体是动词的一种形式，表示动作或状态已经完成，结构是：主动词<span word="have">have</span>的不同时态+-<span word="ed">ed</span>分词。可以分为现在完成体和过去完成体。现在完成体大家比较熟悉了，那么今天小编就和大家一起学习我们不太熟悉的过去完成体~</p><p>过去完成体，顾名思义，就是表示在过去某一时间之前已经发生或完成的动作，也就是我们所说的“过去的过去”。因此，它有“已完成”用法和“未完成”用法。结构为：<span word="had">had</span>+-<span word="ed">ed</span>分词。</p><p>一、“已完成”：表示一个动作或状态在过去某时之前已经完成或结束。</p><p><span word="I">I</span> <span word="had">had</span> <span word="finished">finished</span> <span word="my">my</span> <span word="homework">homework</span> <span word="when">when</span> <span word="my">my</span> <span word="friends">friends</span> <span word="came">came</span>.我朋友来的时候，我就已经完成家庭作业了。</p><p><span word="My">My</span> <span word="father">father</span> <span word="had">had</span> <span word="left">left</span> <span word="for">for</span> <span word="Beijing">Beijing</span> <span word="before">before</span> <span word="I">I</span> <span word="came">came</span> <span word="home">home</span>. 在我到家前，爸爸已经离开去北京了。</p><p>二、“未完成”：表示一个动作或状态在过去某时之前已经开始，一直延续到这一过去时间，而且到那时还未结束，仍有继续下去的可能性。</p><p><span word="Jack">Jack</span> <span word="said">said</span> <span word="that">that</span> <span word="he">he</span> <span word="had">had</span> <span word="made">made</span> <span word="much">much</span> <span word="progress">progress</span> <span word="in">in</span> <span word="English">English</span> <span word="since">since</span> <span word="he">he</span> <span word="came">came</span> <span word="here">here</span>.</p><p>杰克说自从他到这儿以后，英语已经取得了很大进步。</p><p><span word="By">By</span> <span word="six">six</span> <span word="o">o</span>’<span word="clock">clock</span> <span word="these">these</span> <span word="workers">workers</span> <span word="had">had</span> <span word="worked">worked</span> <span word="twelve">twelve</span> <span word="hours">hours</span>. 到六点钟时，这些工人已经工作十二小时了。</p>
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