高中语法详解：名词性从句中的主语从句
<p>名词性从句包括：主语从句、表语从句、宾语从句和同位语从句。引导名词性从句的连词有：</p><p><span word="a">a</span>.连词：<span word="that">that</span>, <span word="whether">whether</span>, <span word="if">if</span>(这三个词都不作从句的成分，同时，<span word="that">that</span>无含义，而<span word="whether">whether</span>和<span word="if">if</span>都表“是否”)</p><p><span word="b">b</span>.疑问代词：<span word="who">who</span>, <span word="whom">whom</span>, <span word="whose">whose</span>, <span word="what">what</span>, <span word="which">which</span></p><p><span word="c">c</span>.疑问副词：<span word="when">when</span>, <span word="where">where</span>, <span word="why">why</span>, <span word="how">how</span></p><p>(一)主语从句</p><p>在复合句中充当主语的从句。</p><p>1.<span word="that">that</span>引导主语从句</p><p><span word="that">that</span>引导主语从句时不同于其他的连词，既无词义也不作成分，只起单纯的连接作用，且通常不可以省。为了强调<span word="that">that</span>引导的主语从句而置之于句首时，<span word="that">that</span>不可省。</p><p>①<span word="That">That</span> <span word="the">the</span> <span word="driver">driver</span> <span word="could">could</span> <span word="not">not</span> <span word="control">control</span> <span word="his">his</span> <span word="car">car</span> <span word="was">was</span> <span word="obvious">obvious</span>.</p><p>②<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>③<span word="That">That</span> <span word="he">he</span> <span word="will">will</span> <span word="come">come</span> <span word="is">is</span> <span word="certain">certain</span>.</p><p>④<span word="That">That</span> <span word="he">he</span> <span word="would">would</span> <span word="take">take</span> <span word="the">the</span> <span word="risk">risk</span> <span word="is">is</span> <span word="true">true</span>.</p><p>⑤<span word="That">That</span> <span word="he">he</span> <span word="should">should</span> <span word="have">have</span> <span word="married">married</span> <span word="her">her</span> <span word="isn">isn</span>'<span word="t">t</span> <span word="surprising">surprising</span>.</p><p>★通常，<span word="that">that</span>引导主语从句时用<span word="it">it</span>做形式主语，把从句置于句尾，此时<span word="that">that</span>有时可省。例如：</p><p>①<span word="It">It</span> <span word="was">was</span> <span word="obvious">obvious</span> <span word="that">that</span> <span word="the">the</span> <span word="driver">driver</span> <span word="could">could</span> <span word="not">not</span> <span word="control">control</span> <span word="his">his</span> <span word="car">car</span>.</p><p>②<span word="It">It</span> <span word="made">made</span> <span word="us">us</span> <span word="very">very</span> <span word="happy">happy</span> <span word="that">that</span> <span word="she">she</span> <span word="was">was</span> <span word="chosen">chosen</span>.</p><p>③<span word="It">It</span> <span word="is">is</span> <span word="certain">certain</span> <span word="that">that</span> <span word="he">he</span> <span word="will">will</span> <span word="come">come</span>.</p><p>④<span word="It">It</span> <span word="is">is</span> <span word="true">true</span> <span word="that">that</span> <span word="he">he</span> <span word="would">would</span> <span word="take">take</span> <span word="the">the</span> <span word="risk">risk</span>.</p>
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