高考英语语法复习精品资料汇总：名词性从句
<p> 名词性从句</p><p> 一、定义：在复合句中相当于一个名词，做主语、宾语、表语、同位语的从句。</p><p> 二、引导词：1. 连词:<span word="that">that</span> , <span word="if">if</span>, <span word="whether">whether</span>, <span word="as">as</span> <span word="if">if</span></p><p> 2. 连接代词:<span word="who">who</span> , <span word="what">what</span>, <span word="which">which</span>, <span word="whose">whose</span>, <span word="whom">whom</span>以及<span word="wh">wh</span>+<span word="ever">ever</span></p><p> 3. 连接副词:<span word="when">when</span>, <span word="where">where</span>, <span word="why">why</span>, <span word="because">because</span>, <span word="how">how</span></p><p> 三、引导词的作用：1 连词只有连接的功能，而不在从句中充当句子成分。</p><p> 2. 连接代词和连接副词不但有连接的功能，同时还要在从句中充当</p><p> 定的句子成分，如主语、宾语、表语、定语、状语</p><p> 四、各个句型的注意点</p><p> 主语从句</p><p> 1.一个主语从句的谓语动词用单数。</p><p> 2.通常为了句子平衡用<span word="it">it</span>做形式主语,而将主语从句放于句尾。</p><p> 3.由<span word="that">that</span>引导的从句，<span word="that">that</span>虽然没有什么意思，但是却不能省略。</p><p> 4.<span word="WH">WH</span>引导的从句,引导词放于句首，从句用陈述句语序。</p><p> 5.放于句首时表示是否只用<span word="whether">whether</span>, 用<span word="IT">IT</span>做形式主语之后，主语从句放于句尾时<span word="whether">whether</span>与<span word="if">if</span>均可以。</p><p> (二)宾语从句</p><p> 1.<span word="that">that</span>引导宾语从句无意义，不充当句子成分常省略。但下列情况除外：</p><p> （1）介词宾语从句的<span word="that">that</span>不省略</p><p> （2） <span word="and">and</span>连接的几个从句，第二个从句以后的从句的<span word="that">that</span>不省略。</p>
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