英语语法名词性从句知识点：名词性从句的关键点
<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> 1. 备考主语从句应注意以下三点</p><p> 一是从句作主语，主句谓语动词用第三人称单数;</p><p> 二是主语从句通常用<span word="it">it</span>作形式主语，尤其是在<span word="It">It</span> <span word="is">is</span> +名词 / 形容词 / 过去分词+<span word="that">that</span>中，或在<span word="It">It</span> <span word="seems">seems</span> / <span word="happens">happens</span> <span word="that">that</span>中，或疑问句中;</p><p> 三要注意由<span word="what">what</span>, <span word="whatever">whatever</span>, <span word="whoever">whoever</span>引导的主语从句一般不用形式主语。</p><p> 2. 备考宾语从句应注意以下四点</p><p> 一是介词后(<span word="except">except</span>等除外)一般不跟<span word="that">that</span>引导的宾语从句，但可接疑问词引导的宾语从句;</p><p> 二是在<span word="that">that</span>引导的宾语从句后若还有补语时，要用<span word="it">it</span>作形式宾语，而将<span word="that">that</span>从句置于补语之后;</p><p> 三是当主句谓语动词是<span word="think">think</span>, <span word="believe">believe</span>, <span word="suppose">suppose</span>, <span word="expect">expect</span>, <span word="imagine">imagine</span>等时，若宾语从句要表示否定意义，往往要通过否主句来实现，即所谓否定转移;</p><p> 四是虽然引导宾语从句的<span word="that">that</span>有时可以省略，但若宾语从句前有插入语或有间接宾语时，<span word="that">that</span>不能省略;<span word="that">that</span>在与之并列的另一个宾语从句之后或者在形式宾语<span word="it">it</span>+宾补之后时也不能省略;<span word="that">that</span>从句单独回答问题时，<span word="that">that</span>也不能省略。</p>
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