名词性从句的用法
<p>在句子中起名词作用的句子叫名词性从句(<span word="Noun">Noun</span> <span word="Clauses">Clauses</span>)。名词性从句的功能相当于名词词组，它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。</p><p>引导名词性从句的连接词可分为三类：</p><p>连接词：<span word="that">that</span>, <span word="whether">whether</span>, <span word="if">if</span> (不充当从句的任何成分)</p><p>连接代词：<span word="what">what</span>, <span word="whatever">whatever</span>, <span word="who">who</span>, <span word="whoever">whoever</span>, <span word="whom">whom</span>, <span word="whose">whose</span>, <span word="which">which</span></p><p>连接副词：<span word="when">when</span>, <span word="where">where</span>, <span word="how">how</span>, <span word="why">why</span></p><p>不可省略的连词：</p><p>1. 介词后的连词</p><p>2. 引导主语从句和同位语从句的连词不可省略</p><p><span word="That">That</span> <span word="she">she</span> <span word="was">was</span> <span word="chosen">chosen</span> <span word="made">made</span> <span word="us">us</span> <span word="very">very</span> <span word="happy">happy</span>.</p><p><span word="We">We</span> <span word="heard">heard</span> <span word="the">the</span> <span word="news">news</span> <span word="that">that</span> <span word="our">our</span> <span word="team">team</span> <span word="had">had</span> <span word="won">won</span>.</p><p>【比较】<span word="whether">whether</span>与<span word="if">if</span>均为&<span word="ldquo">ldquo</span>;是否的意思。但在下列情况下，<span word="whether">whether</span>不能被<span word="if">if</span>取代：</p><p>1. <span word="whether">whether</span>引导主语从句并在句首</p><p>2. 引导表语从句</p><p>3. <span word="whether">whether</span>从句作介词宾语</p><p>4. 从句后有"<span word="or">or</span> <span word="not">not</span>"，例：<span word="Whether">Whether</span> <span word="he">he</span> <span word="will">will</span> <span word="come">come</span> <span word="or">or</span> <span word="not">not</span> <span word="is">is</span> <span word="not">not</span> <span word="clear">clear</span>.</p><p>大部分连接词引导的主语从句都可以置于句末，用<span word="it">it</span>充当形式主语：</p><p><span word="It">It</span> <span word="is">is</span> <span word="not">not</span> <span word="important">important</span> <span word="who">who</span> <span word="will">will</span> <span word="go">go</span>.</p><p><span word="It">It</span> <span word="is">is</span> <span word="still">still</span> <span word="unknown">unknown</span> <span word="which">which</span> <span word="team">team</span> <span word="will">will</span> <span word="win">win</span> <span word="the">the</span> <span word="match">match</span>.</p>
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