英语语法名词性从句知识点：四类名词性从句详解
<p> 【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p> 所谓名词性从句，就是指其作用相当于名词的从句，它包括主语从句、表语从句、宾语从句和同位语从句。</p><p> 一、主语从句</p><p> 1. 引导词：主语从句就是在复合句中用作主语的从句，引导主语从句的引导词主要有三类：一是<span word="that">that</span>;二是<span word="whether">whether</span>;三是那些可以用作疑问词的词语，如<span word="what">what</span>, <span word="who">who</span>, <span word="which">which</span>, <span word="when">when</span>, <span word="where">where</span>, <span word="how">how</span>, <span word="why">why</span>等。如：</p><p> <span word="That">That</span> <span word="we">we</span> <span word="shall">shall</span> <span word="be">be</span> <span word="late">late</span> <span word="is">is</span> <span word="certain">certain</span>. 我们要晚了，这是确定无疑的。</p><p> <span word="What">What</span> <span word="he">he</span> <span word="says">says</span> <span word="is">is</span> <span word="not">not</span> <span word="important">important</span>. 他说的话并不重要。</p><p> <span word="How">How</span> <span word="this">this</span> <span word="happened">happened</span> <span word="is">is</span> <span word="not">not</span> <span word="clear">clear</span> <span word="to">to</span> <span word="anyone">anyone</span>. 这件事怎样发生的，谁也不清楚。</p><p> <span word="Which">Which</span> <span word="side">side</span> <span word="wins">wins</span> <span word="makes">makes</span> <span word="no">no</span> <span word="difference">difference</span> <span word="to">to</span> <span word="him">him</span>. 哪边赢他都无所谓。</p><p> <span word="Whether">Whether</span> <span word="it">it</span> <span word="will">will</span> <span word="do">do</span> <span word="us">us</span> <span word="harm">harm</span> <span word="remains">remains</span> <span word="to">to</span> <span word="be">be</span> <span word="seen">seen</span>. 是否对我们有害还要看一看。</p><p> 2. 形式主语：有时为了避免句子显得头重脚轻，可用<span word="it">it</span>作形式主语放在句首，而把真正的主语放在句末。如：</p><p> <span word="Its">Its</span> <span word="a">a</span> <span word="pity">pity</span> <span word="that">that</span> <span word="he">he</span> <span word="didnt">didnt</span> <span word="come">come</span>. 很遗憾他没来。</p><p> <span word="Its">Its</span> <span word="not">not</span> <span word="yet">yet</span> <span word="known">known</span> <span word="what">what</span> <span word="she">she</span> <span word="did">did</span>. 她做什么还不得而知。</p>
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