2017高考英语一轮语法对点讲练：5 名词性从句
<p> 语法对点讲练五 名词性从句</p><p> 名词性从句的功能相当于名词词组，能在句中充当主语、宾语、表语、同位语、介词宾语等。因此名词性从句又分为主语从句、宾语从句、表语从句和同位语从句。</p><p> 引导词归类：</p><p> 类别 功能 引导词</p><p> 从属连词 只起连接作用，不充当句子成分 <span word="that">that</span>, <span word="whether">whether</span>, <span word="if">if</span></p><p> 连接代词 起连接作用，并充当主语、宾语、表语或定语 <span word="who">who</span>, <span word="whom">whom</span>, <span word="whose">whose</span>, <span word="which">which</span>, <span word="what">what</span>, <span word="whatever">whatever</span>, <span word="whichever">whichever</span>, <span word="whoever">whoever</span></p><p> 连接副词 起连接作用，并充当从句状语 <span word="when">when</span>, <span word="where">where</span>, <span word="how">how</span>, <span word="why">why</span></p><p> 一、主语从句</p><p> 知识点讲解</p><p> 1．主语从句的一般结构</p><p> ①主语从句一般放于主句谓语动词前，构成：主语从句＋谓语动词＋其他。</p><p> 2．<span word="it">it</span>作形式主语的主语从句</p><p> ②<span word="It">It</span>＋<span word="be">be</span>/<span word="become">become</span>(<span word="s">s</span>)＋形容词/名词/过去分词＋主语从句。</p><p> <span word="It">It</span> <span word="is">is</span> <span word="clear">clear</span> <span word="that">that</span> <span word="the">the</span> <span word="whale">whale</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="fish">fish</span>.</p><p> ③<span word="It">It</span> <span word="seems">seems</span>/<span word="appears">appears</span>等动词＋<span word="that">that</span>从句。</p><p> <span word="It">It</span> <span word="happens">happens</span> <span word="that">that</span> <span word="he">he</span> <span word="can">can</span> <span word="understand">understand</span> <span word="a">a</span> <span word="little">little</span> <span word="about">about</span> <span word="the">the</span> <span word="language">language</span>.</p><p> ④<span word="It">It</span> <span word="remains">remains</span> <span word="to">to</span> <span word="be">be</span>＋过去分词＋主语从句。</p><p> ⑤<span word="It">It</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="matter">matter</span>＋<span word="how">how</span>/<span word="whether">whether</span>从句。</p><p> <span word="It">It</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="matter">matter</span> <span word="whether">whether</span> <span word="he">he</span> <span word="is">is</span> <span word="wrong">wrong</span> <span word="or">or</span> <span word="not">not</span>.</p>
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