英语语法名词性从句知识点：that与whether引导名词性从句
<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> 两者均可引导宾语从句，也可引导语从句和表语从句(<span word="if">if</span> 通常不行)，但两者含义不同，<span word="whether">whether</span> (<span word="if">if</span>) 表示是否，<span word="that">that</span> 却不表示任何含义。在它们所引出的从句中，<span word="that">that</span> 表示一种肯定、明确的概念，而 <span word="whether">whether</span> (<span word="if">if</span>) 则表示一种不肯定、不明确的概念。比较：</p><p> <span word="Whether">Whether</span> <span word="hell">hell</span> <span word="come">come</span> <span word="is">is</span> <span word="not">not</span> <span word="known">known</span> <span word="yet">yet</span>. 他是否来还不清楚。</p><p> <span word="That">That</span> <span word="hell">hell</span> <span word="come">come</span> <span word="is">is</span> <span word="known">known</span> <span word="to">to</span> <span word="us">us</span> <span word="all">all</span>. 我们都知道他会来。</p><p> 类似地，动词<span word="doubt">doubt</span> (怀疑)后接宾语从句时，由于 <span word="doubt">doubt</span>的含义不确定，故通常用 <span word="whether">whether</span> (<span word="if">if</span>) 来引导其宾语从句，但若 <span word="doubt">doubt</span>为否定式，则其后的宾语从句用 <span word="that">that</span> 来引导。如：</p><p> <span word="I">I</span> <span word="doubt">doubt</span> <span word="if">if</span> <span word="you">you</span> <span word="are">are</span> <span word="honest">honest</span>. 我怀疑你是否诚实。</p><p> <span word="I">I</span> <span word="dont">dont</span> <span word="doubt">doubt</span> <span word="that">that</span> <span word="you">you</span> <span word="are">are</span> <span word="honest">honest</span>. 我不怀疑你是诚实的。</p>
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