英语语法名词性从句知识：应注意的两个问题
<p> 一、词序问题</p><p> 名词性从句总是用陈述句词序，则不能使用疑问句词序，尤其是当名词性从句由疑问词引导时，不能受疑问句的影响而误用疑问句词序：</p><p> 误：<span word="I">I</span> <span word="didnt">didnt</span> <span word="know">know</span> <span word="where">where</span> <span word="did">did</span> <span word="he">he</span> <span word="live">live</span>.</p><p> 正：<span word="I">I</span> <span word="didnt">didnt</span> <span word="know">know</span> <span word="where">where</span> <span word="he">he</span> <span word="lived">lived</span>. 我不知道他住哪儿。</p><p> 误：<span word="Who">Who</span> <span word="will">will</span> <span word="he">he</span> <span word="marry">marry</span> <span word="remains">remains</span> <span word="unknown">unknown</span>.</p><p> 正：<span word="Who">Who</span> <span word="he">he</span> <span word="will">will</span> <span word="marry">marry</span> <span word="remains">remains</span> <span word="unknown">unknown</span>. 他同谁结婚还不知道。</p><p> 二、时态问题</p><p> 由于由<span word="when">when</span>引导的时间状语从句和以<span word="if">if</span>引导的条件状语从句要用现在时表示将来意义，而不能直接使用将来时态，所以许多同学容易受此影响在<span word="when">when</span>和<span word="if">if</span>引导名词性从句时也用现在时表示将来意义。请看几题：</p><p> (1) <span word="I">I</span> <span word="dont">dont</span> <span word="know">know</span> <span word="if">if</span> <span word="he">he</span> ________ <span word="or">or</span> <span word="not">not</span> <span word="tomorrow">tomorrow</span>.</p><p> <span word="A">A</span>. <span word="come">come</span> <span word="B">B</span>. <span word="comes">comes</span></p><p> <span word="C">C</span>. <span word="will">will</span> <span word="come">come</span> <span word="D">D</span>. <span word="is">is</span> <span word="coming">coming</span></p><p> 此题答案选<span word="C">C</span>，句中<span word="if">if</span>引导的不是条件状语从句(<span word="if">if</span>如果)，而是宾语从句(<span word="if">if</span>=是否)，句意为我不知道明天他是否会来。</p><p> (2) <span word="I">I</span> <span word="dont">dont</span> <span word="know">know</span> <span word="if">if</span> <span word="she">she</span> ________, <span word="but">but</span> <span word="if">if</span> <span word="she">she</span> ________ <span word="I">I</span> <span word="will">will</span> <span word="let">let</span> <span word="you">you</span> <span word="know">know</span>.</p><p> <span word="A">A</span>. <span word="comes">comes</span>, <span word="comes">comes</span> <span word="B">B</span>. <span word="will">will</span> <span word="come">come</span>, <span word="will">will</span> <span word="come">come</span></p><p> <span word="C">C</span>. <span word="comes">comes</span>, <span word="will">will</span> <span word="come">come</span> <span word="D">D</span>. <span word="will">will</span> <span word="come">come</span>, <span word="comes">comes</span></p><p> 答案选 <span word="D">D</span>，第一个 <span word="if">if</span> 引导的是宾语从句，第二个 <span word="if">if</span> 引导的是条件状语从句。</p>
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