高三英语语法和惯用法：主语从句与形式主语it
<p> 有时为了考虑句子平衡，通常在主语从句处使用形式主语 <span word="it">it</span>，而将真正的主语从句移至句末。这分三种情况。如：</p><p> (1) 对于以连词<span word="that">that</span>引导的主语从句，通常用形式主语代主语从句。如：</p><p> <span word="Its">Its</span> <span word="a">a</span> <span word="pity">pity</span> <span word="that">that</span> <span word="he">he</span> <span word="didnt">didnt</span> <span word="come">come</span>. 很遗憾他没来。</p><p> (2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句。如：</p><p> <span word="Whether">Whether</span> <span word="they">they</span> <span word="would">would</span> <span word="support">support</span> <span word="us">us</span> <span word="was">was</span> <span word="a">a</span> <span word="problem">problem</span>. 他们是否会支持我们还是一个问题。</p><p> <span word="It">It</span> <span word="was">was</span> <span word="a">a</span> <span word="problem">problem</span> <span word="whether">whether</span> <span word="they">they</span> <span word="would">would</span> <span word="support">support</span> <span word="us">us</span>. 他们是否会支持我们还是一个问题。</p><p> (3) 对关系代词型<span word="what">what</span>引导的主语从句，通常不用形式主语，总是主语从句放在句首。如：</p><p> <span word="What">What</span> <span word="we">we</span> <span word="need">need</span> <span word="is">is</span> <span word="money">money</span>. 我们需要的是钱。</p><p> <span word="What">What</span> <span word="I">I</span> <span word="want">want</span> <span word="to">to</span> <span word="know">know</span> <span word="is">is</span> <span word="this">this</span>. 我想知道的就是这一点。</p><p> (4) 如果句子是疑问句，则必须用带形式主语<span word="it">it</span>的结构。如：</p><p> <span word="Is">Is</span> <span word="it">it</span> <span word="true">true</span> <span word="that">that</span> <span word="he">he</span> <span word="is">is</span> <span word="the">the</span> <span word="girls">girls</span> <span word="father">father</span>? 他是那女孩的父亲，是真的吗?</p><p> <span word="How">How</span> <span word="is">is</span> <span word="it">it</span> <span word="that">that</span> <span word="you">you</span> <span word="are">are</span> <span word="late">late</span> <span word="again">again</span>? 你怎么又迟到了?</p>
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