中考英语语法：as的用法
<p>&<span word="nbsp">nbsp</span>;</p><p> 中考想要拿高分，学好基础语法是关键，下面就详细讲解关于<span word="as">as</span>的用法：</p><p> 一、作副词，意为&<span word="ldquo">ldquo</span>;相同地，&<span word="ldquo">ldquo</span>;同样地。例如：</p><p> <span word="They">They</span> <span word="don">don</span>&<span word="rsquo">rsquo</span>;<span word="t">t</span> <span word="have">have</span> <span word="as">as</span> <span word="many">many</span> <span word="airplanes">airplanes</span>. 他们没有同样多的飞机。</p><p> 二、作连词，</p><p> 1. 引导时间状语从句</p><p> <span word="as">as</span>与<span word="when">when</span>，<span word="while">while</span>都是引导时间状语从句的从属连词，含义都是"当&<span word="hellip">hellip</span>;&<span word="hellip">hellip</span>;的时候"。但它们有区别:</p><p> (1). <span word="when">when</span>作&<span word="ldquo">ldquo</span>;当&<span word="hellip">hellip</span>;&<span word="hellip">hellip</span>;的时候解，可以指较短的(一点)时间,也可指一段时间。从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生。例如:</p><p> <span word="John">John</span> <span word="was">was</span> <span word="having">having</span> <span word="his">his</span> <span word="dinner">dinner</span> <span word="when">when</span> <span word="I">I</span> <span word="saw">saw</span> <span word="him">him</span>. 当我看到约翰的时候，他正在吃饭。</p><p> <span word="She">She</span> <span word="can">can</span> <span word="write">write</span> <span word="only">only</span> <span word="when">when</span> <span word="the">the</span> <span word="baby">baby</span> <span word="is">is</span> <span word="asleep">asleep</span>. 只有婴儿睡着的时候，她才能写作。</p><p> (2). <span word="while">while</span>常表示一段较长的时间或一个过程，强调主句谓语动词与从句谓语动词同时发生或在从句动作过程中发生。例如:</p><p> <span word="We">We</span> <span word="must">must</span> <span word="strike">strike</span> <span word="while">while</span> <span word="the">the</span> <span word="iron">iron</span> <span word="is">is</span> <span word="hot">hot</span>. 要趁热打铁。</p><p> <span word="While">While</span> <span word="we">we</span> <span word="were">were</span> <span word="reading">reading</span>, <span word="the">the</span> <span word="teacher">teacher</span> <span word="came">came</span> <span word="in">in</span>. 我们正在读书的时候，老师走了进来。</p><p> (3). 但属下列情形时，只用<span word="as">as</span>, 而不用<span word="when">when</span>或<span word="while">while</span>。</p>
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