职称英语理工类语法词汇常见考点：名词性从句
<p> 名词性从句</p><p> 一个主句和一个或一个以上的从句组成的句子称为复合句。主句是句的主体，从句只用作句子的一个成分而从属于主句，从句种类由从句在句中所起的作用而定。充当主语、宾语、表语、同位语、定语和状语的从句分别称为主语从句、宾语从句、表语从句、同位语从句、定语从句和状语从句。其中主语、宾语、表语和同位语从句在句中的作用相当于名词通常在句中所起的作用，因而统称为名词性从句。1)引导这些从句的词主要有三类：</p><p> 1.从属连词：<span word="that">that</span>，<span word="whether">whether</span>，<span word="if">if</span></p><p> 2.连接代词：<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> 3.连接副词：<span word="when">when</span>，<span word="where">where</span>，<span word="why">why</span>，<span word="how">how</span></p><p> 2)主语从句：</p><p> 主语从句在句子中从当主语，在主语从句所在句子结构形式是从句+谓语，如：</p><p> <span word="That">That</span> <span word="the">the</span> <span word="sea">sea</span> <span word="covers">covers</span> <span word="about">about</span> <span word="three">three</span>-<span word="fourths">fourths</span> 0<span word="f">f</span> <span word="the">the</span> <span word="earths">earths</span> <span word="surface">surface</span> <span word="is">is</span> <span word="well">well</span> <span word="known">known</span>.众所周知海洋约占地球表面的四分之三。</p><p> 对于主语从句要注意主语谓语一致性的原则：句子的主语是主语从句时，谓语部分应该使用单数的形式，如：</p><p> <span word="When">When</span> <span word="she">she</span> <span word="went">went</span> <span word="there">there</span> <span word="and">and</span> <span word="what">what</span> <span word="she">she</span> <span word="did">did</span> <span word="are">are</span> <span word="still">still</span> <span word="uncertain">uncertain</span>.也是什么时候去哪里的，她在哪里做了什么，这些都还不能确定。</p><p> 3)宾语从句</p>
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