高中英语 语法精讲（Unit 18New Zealand）人教版
<p> 语法精讲<span word="The">The</span> <span word="Use">Use</span> <span word="of">of</span> “<span word="It">It</span>” (1) <span word="as">as</span> <span word="Subject">Subject</span>“<span word="It">It</span>”的用法(1)作主语</p><p> 1.<span word="it">it</span>用作人称代词，指前面提到过的人或物。</p><p> <span word="The">The</span> <span word="frog">frog</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="warm">warm</span><span word="blooded">blooded</span> <span word="animal">animal</span>.<span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="cold">cold</span><span word="blooded">blooded</span> <span word="one">one</span>.</p><p> 青蛙不是温血动物，而是冷血动物。(指代<span word="the">the</span> <span word="frog">frog</span>)</p><p> —<span word="Who">Who</span> <span word="is">is</span> <span word="knocking">knocking</span> <span word="at">at</span> <span word="the">the</span> <span word="door">door</span>?</p><p> 谁在敲门？</p><p> —<span word="It">It</span> <span word="is">is</span> <span word="me">me</span>.</p><p> 是我。(指代人)</p><p> —<span word="What">What</span> <span word="is">is</span> <span word="this">this</span>?</p><p> 那是什么？</p><p> —<span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="flag">flag</span>.<span word="It">It</span> <span word="is">is</span> <span word="hers">hers</span>.</p><p> 是一面旗，那是她的。(指代<span word="this">this</span>或<span word="that">that</span>)</p><p> 2.<span word="it">it</span>也可用作非人称代词，表示天气、日期、时间、温度、距离、环境情况等。</p><p> <span word="It">It</span> <span word="was">was</span> <span word="very">very</span> <span word="noisy">noisy</span> <span word="at">at</span> <span word="the">the</span> <span word="moment">moment</span>.</p><p> 现在外面很吵。(指环境情况)</p><p> —<span word="What">What</span> <span word="time">time</span> <span word="is">is</span> <span word="it">it</span>?</p><p> 几点了？</p><p> —<span word="It">It</span> <span word="is">is</span> <span word="eight">eight</span> <span word="o">o</span>’<span word="clock">clock</span>.</p><p> 8点了(指时间)</p><p> <span word="It">It</span> <span word="is">is</span> <span word="five">five</span> <span word="kilometers">kilometers</span> <span word="from">from</span> <span word="the">the</span> <span word="office">office</span> <span word="to">to</span> <span word="my">my</span> <span word="home">home</span>.</p><p> 从办公室到我家5千米。(指距离)</p><p> 3.<span word="it">it</span>常用作形式主语或形式宾语，而把真正的主语或宾语(不定式、动词<span word="ing">ing</span>形式或名词性从句)置于句尾，以满足句子的需要。</p><p> <span word="it">it</span>作形式主语，常用于下列结构：</p>
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