高三英语语法和惯用法：what 与that引导名词性从句时的区别
<p> 两者均可引导主语、表语、宾语从句，区别是 <span word="what">what</span> 可在从句中用作主语、宾语或表语，意为什么或所的，而 <span word="that">that</span> 仅起连接作用，本身没有实际意义，在从句中也不充当任何句子成分(引导宾语从句时通常可以省略)。如：</p><p> <span word="He">He</span> <span word="doesnt">doesnt</span> <span word="know">know</span> <span word="what">what</span> <span word="she">she</span> <span word="likes">likes</span>. 他不知道她喜欢什么。</p><p> <span word="What">What</span> <span word="you">you</span> <span word="say">say</span> <span word="is">is</span> <span word="quite">quite</span> <span word="right">right</span>. 你所说的相当正确。</p><p> <span word="I">I</span> <span word="believe">believe</span> (<span word="that">that</span>) <span word="he">he</span> <span word="will">will</span> <span word="come">come</span> <span word="to">to</span> <span word="see">see</span> <span word="us">us</span>. 我相信他会来看我们的。</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="finish">finish</span> <span word="college">college</span>. 真遗憾他大学没毕业。</p><p> 另外，<span word="that">that</span> 可引导同位语从句，但 <span word="what">what</span> 通常不用于引导同位语从句。如：</p><p> <span word="I">I</span> <span word="had">had</span> <span word="no">no</span> <span word="idea">idea</span> <span word="that">that</span> <span word="you">you</span> <span word="were">were</span> <span word="here">here</span>. 我不知道你在这儿。</p>
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