英语语法名词性从句知识：主语从句学习指要
<p> 用来作主语的句子叫做主语从句。如：</p><p> (1)<span word="When">When</span> <span word="he">he</span> <span word="was">was</span> <span word="born">born</span> <span word="is">is</span> <span word="unknown">unknown</span>. 他生于何时还不知道。</p><p> (2)<span word="What">What</span> <span word="he">he</span> <span word="did">did</span> <span word="last">last</span> <span word="night">night</span> <span word="is">is</span> <span word="being">being</span> <span word="investigated">investigated</span>. 他昨天晚上干了些什么正在调查之中。</p><p> 在主语从句中须注意：</p><p> 1. 主语从句一般用<span word="it">it</span>作形式主语，放在句首，而将主语从句放到句末。如：</p><p> (1)<span word="It">It</span> <span word="is">is</span> <span word="possible">possible</span> <span word="that">that</span> <span word="he">he</span> <span word="has">has</span> <span word="stolen">stolen</span> <span word="the">the</span> <span word="car">car</span>. 很可能他偷了小车。</p><p> (2)<span word="Isnt">Isnt</span> <span word="it">it</span> <span word="strange">strange</span> <span word="that">that</span> <span word="he">he</span> <span word="should">should</span> <span word="not">not</span> <span word="have">have</span> <span word="passed">passed</span> <span word="the">the</span> <span word="test">test</span>? 他测试没有通过，难道不奇怪吗?</p><p> 2. <span word="if">if</span>引导主语从句时，只能用<span word="it">it</span>作形式主语，放在句首，而将<span word="if">if</span>引导的主语从句放到句末。如：</p><p> <span word="It">It</span> <span word="is">is</span> <span word="uncertain">uncertain</span> <span word="if">if</span> <span word="he">he</span> <span word="will">will</span> <span word="leave">leave</span> <span word="for">for</span> <span word="Beijing">Beijing</span> <span word="tomorrow">tomorrow</span>. 明天他是否去北京还不敢肯定。</p><p> 3. <span word="that">that</span>引导主语从句放在句首时，<span word="that">that</span>不可省，但在句末口语中可省。如：</p><p> <span word="That">That</span> <span word="he">he</span> <span word="was">was</span> <span word="ill">ill</span> <span word="yesterday">yesterday</span> <span word="is">is</span> <span word="known">known</span> <span word="now">now</span>. 大家都已知道他昨天生了病。</p><p> 4. 连接代词引导主语从句只能放在句首。如;</p><p> (1)<span word="Who">Who</span> <span word="has">has</span> <span word="broken">broken</span> <span word="the">the</span> <span word="glass">glass</span> <span word="is">is</span> <span word="unknown">unknown</span>. 谁打破了玻璃现在还不知道。</p><p> (2)<span word="What">What</span> <span word="he">he</span> <span word="wants">wants</span> <span word="is">is</span> <span word="all">all</span> <span word="here">here</span>. 他所要的东西都在这里。</p><p> 5. 主语从句中主句的谓语动词一般用第三人称单数形式，但<span word="what">what</span>引导主语从句的主句谓语动词的形式须根据句子的意思来判断。如</p>
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