从属连词有哪些?它们与从句息息相关
<p>从结构上说，英语连词分两大类：并列连词和从属连词。并列连词连接两个或两个以上地位平等的字、词组或分句。而从属连词，连接两个或两个以上的分句，以此来形成复杂句中的从属分句。其引导的句子与主句的地位不平等，处在从属的地位，因此称之为从属连词。</p><p>从属连词主要用来引导名词性从句和状语从句。名词性从句主要有：主语从句、宾语从句、表语从句和同位语从句;而状语从句主要有时间、条件、目的、结果、原因、让步、方式、地点和比较状语从句。各种从句的连词主要如下表所示：</p><p>以上连词的用法主要如下：</p><p>1. 名词性从句：</p><p>(1)<span word="that">that</span>, <span word="if">if</span> 和<span word="whether">whether</span>：<span word="that">that</span>表示肯定、确定之意;<span word="if">if</span> 和<span word="whether">whether</span>译为“是否”，含有否定、不确定之意。</p><p><span word="Whether">Whether</span> <span word="he">he</span> <span word="will">will</span> <span word="come">come</span> <span word="here">here</span> <span word="is">is</span> <span word="still">still</span> <span word="unknown">unknown</span> <span word="to">to</span> <span word="us">us</span>. 我们还不知道他来不来。</p><p><span word="I">I</span> <span word="doubt">doubt</span> (<span word="whether">whether</span>) <span word="if">if</span> <span word="the">the</span> <span word="answer">answer</span> <span word="is">is</span> <span word="right">right</span>. 我怀疑这答案是否正确。</p><p><span word="I">I</span> <span word="don">don</span>’<span word="t">t</span> <span word="doubt">doubt</span> <span word="that">that</span> <span word="the">the</span> <span word="answer">answer</span> <span word="is">is</span> <span word="right">right</span>. 我不怀疑这答案是正确的。</p><p>(2)<span word="if">if</span> 和<span word="whether">whether</span>：引导宾语从句时，两者可互换;引导主语、同位语和表语从句时，只能用<span word="whether">whether</span>，不能用<span word="if">if</span>。</p><p>宾从：<span word="He">He</span> <span word="wanted">wanted</span> <span word="to">to</span> <span word="know">know</span> <span word="whether">whether</span> (<span word="if">if</span>) <span word="they">they</span> <span word="could">could</span> <span word="help">help</span> <span word="him">him</span>. 他想知道他们能否帮他。</p>
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