高中英语语法详解：定语从句的结构
<p>定语从句用来充当句中定语的主谓结构;它主要用于修饰句子中的名词、代词。</p><p>定语从句的位置常常是紧跟在被修饰的名词、代词的后面。在被修饰的名词、代词与定语从句之间往往有一个关系词将其前后两部分联系成一个整体，或是构成一个名词短语;或是构成一个代词短语。</p><p>从结构上说，关系词与从句是一个整体。</p><p>排除句子的其他各部分，这种带有定语从句的名词短语或是代词短语的构成可演示如下：</p><p>1)<span word="Three">Three</span> <span word="signs">signs</span> <span word="that">that</span> <span word="indicate">indicate</span> <span word="a">a</span> <span word="person">person</span> <span word="is">is</span> <span word="suffering">suffering</span> <span word="from">from</span> <span word="a">a</span> <span word="panic">panic</span> <span word="attack">attack</span> <span word="rather">rather</span> <span word="than">than</span> <span word="a">a</span> <span word="heart">heart</span> <span word="attack">attack</span>.三种意味着一个人是患有惊恐症而不是心脏病的迹象。</p><p>在这个带有定语从句的名词短语中：<span word="signs">signs</span>是：被修饰的名词; <span word="that">that</span>是：关系词;<span word="that">that</span> <span word="indicate">indicate</span> <span word="a">a</span> <span word="person">person</span> <span word="is">is</span> <span word="suffering">suffering</span> <span word="from">from</span> <span word="a">a</span> <span word="panic">panic</span> <span word="attack">attack</span> <span word="rather">rather</span> <span word="than">than</span> <span word="a">a</span> <span word="heart">heart</span> <span word="attack">attack</span>是定语从句</p><p>2)<span word="Those">Those</span> <span word="who">who</span> <span word="drink">drink</span> <span word="a">a</span> <span word="lot">lot</span>. 那些大量饮酒的人。</p><p>在这个带有定语从句的代词短语中：<span word="those">those</span>是：被修饰的名词; <span word="who">who</span>是：关系词;</p><p>定语从句通过上面的演示,我们可以归纳出定语从句在句子中的位置、结构如下：被修饰的名词 / 代词 + 关系词 + 句子 (其中，"被修饰的名词/代词"在语法叫作"先行词".)</p>
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