初二英语上册语法复习详解（40）-ago与before
<p> 40) <span word="ago">ago</span>与<span word="before">before</span></p><p> <span word="ago">ago</span>与<span word="before">before</span>都表示......以前，但用法有所区别。</p><p> 1.<span word="ago">ago</span>意为以前，表示从此刻算起的若干时间之前，常用于过去时的句子</p><p> 中。如：<span word="He">He</span> <span word="took">took</span> <span word="a">a</span> <span word="photo">photo</span> <span word="a">a</span> <span word="week">week</span> <span word="ago">ago</span>. 他一周前照了一张相片。</p><p> 2.<span word="before">before</span>作为副词时表示：</p><p> <span word="a">a</span>.从过去某一时刻算起的若干时间以前，用于过去完成时的句子中。如：</p><p> <span word="The">The</span> <span word="boy">boy</span> <span word="had">had</span> <span word="already">already</span> <span word="seen">seen</span> <span word="the">the</span> <span word="comedy">comedy</span> <span word="before">before</span>.</p><p> 那男孩以前已经看过那部喜剧片了。</p><p> <span word="b">b</span>.笼统的以前，用于一般过去时或现在完成时的句子中，一般单独使</p><p> 用，而<span word="ago">ago</span>不可以单独使用。如：</p><p> <span word="Hes">Hes</span> <span word="read">read</span> <span word="this">this</span> <span word="novel">novel</span> <span word="before">before</span>. 他以前读过这部小说。</p>
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