高考英语语法复习及配套练习三：名词性从句
<p> 语法复习三：名词性从句</p><p> 名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句厅分为主语从句、表语从句、宾语从句和同位从句。</p><p> （一）引导名词性从句的连接词</p><p> 1、连接代词：<span word="who">who</span>, <span word="whose">whose</span>, <span word="whom">whom</span>, <span word="what">what</span>, <span word="which">which</span>。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。</p><p> 2、连接副词：<span word="when">when</span>, <span word="where">where</span>, <span word="why">why</span>, <span word="how">how</span>。有词义，在从句中担任成分，作状语。</p><p> 3、连接词：<span word="that">that</span>, <span word="whether">whether</span>, <span word="if">if</span>, <span word="as">as</span> <span word="if">if</span>。<span word="that">that</span> 无词义，在从句中不担任成分，有时可省略；<span word="if">if</span> (<span word="whether">whether</span>), <span word="as">as</span> <span word="if">if</span>虽有词义，但在从句中不担任成分。</p><p> 注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。连接代词与连接副词在从句充当句子成分，连接词<span word="whether">whether</span> 和<span word="if">if</span>（是否），<span word="as">as</span> <span word="if">if</span>（好象）在从句中不充当句子成分，只起连接作用。根据句义，如果连接代词与连接副词，<span word="whether">whether</span>、<span word="if">if</span> 和<span word="as">as</span> <span word="if">if</span>都用不上时，才用<span word="that">that</span>作连接词（<span word="that">that</span>本身无任何含义）。</p><p> （二）主语从句</p><p> 1、主语从句在复合句作主语。</p><p> <span word="e">e</span>.<span word="g">g</span>. <span word="Who">Who</span> <span word="will">will</span> <span word="go">go</span> <span word="is">is</span> <span word="not">not</span> <span word="important">important</span>.</p><p> 2、用<span word="it">it</span>作形式主语，主语从句放在句末。</p><p> <span word="e">e</span>.<span word="g">g</span>. <span word="It">It</span> <span word="doesn">doesn</span>’<span word="t">t</span> <span word="matter">matter</span> <span word="so">so</span> <span word="much">much</span> <span word="whether">whether</span> <span word="you">you</span> <span word="will">will</span> <span word="come">come</span> <span word="or">or</span> <span word="not">not</span>.</p>
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