高二英语语法：不定式的用法
<p> 高二英语语法：不定式的用法</p><p> 动词不定式具有名词、形容词和副词的特征。因此在句中可以做主语、表语、宾语、宾语补足语、定语和状语。</p><p> 一、不定式做主语：</p><p> 1、不定式做主语一般表示具体的某次动作。===动名词<span word="doing">doing</span> 表示习惯的，经常的动作。</p><p> <span word="e">e</span>.<span word="g">g</span>: <span word="To">To</span> <span word="finish">finish</span> <span word="the">the</span> <span word="building">building</span> <span word="in">in</span> <span word="a">a</span> <span word="month">month</span> <span word="is">is</span> <span word="difficult">difficult</span>.</p><p> <span word="To">To</span> <span word="do">do</span> <span word="such">such</span> <span word="things">things</span> <span word="is">is</span> <span word="foolish">foolish</span>.</p><p> <span word="To">To</span> <span word="see">see</span> <span word="is">is</span> <span word="to">to</span> <span word="believe">believe</span>. (对等)</p><p> 注: 1). 不定式作主语时,谓语用单数</p><p> 2). 当主语较长，谓语较短时，常用<span word="it">it</span>做形式主语，而将不定式放到谓语的后面。</p><p> <span word="it">it</span>做形式主语，不定式放在谓语动词之后常用于下列结构中：</p><p> (1)<span word="It">It</span> <span word="is">is</span>/<span word="was">was</span> +<span word="adj">adj</span>.+<span word="of">of</span> <span word="sb">sb</span>. <span word="to">to</span> <span word="do">do</span></p><p> (2) <span word="It">It</span> <span word="is">is</span> +<span word="adj">adj</span>.+<span word="for">for</span> <span word="sb">sb</span>.+<span word="to">to</span> <span word="do">do</span></p><p> <span word="It">It</span> <span word="is">is</span> <span word="easy">easy</span> / <span word="difficult">difficult</span> / <span word="hard">hard</span> / <span word="foolish">foolish</span> / <span word="unwise">unwise</span> / <span word="right">right</span> / <span word="wrong">wrong</span> / <span word="unnecessary">unnecessary</span></p><p> (3) <span word="it">it</span> <span word="is">is</span> +<span word="a">a</span> +名词+ <span word="to">to</span> <span word="do">do</span>...</p><p> ? <span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="pity">pity</span> / <span word="a">a</span> <span word="pleasure">pleasure</span> / <span word="a">a</span> <span word="pleasant">pleasant</span> <span word="thing">thing</span> / <span word="ones">ones</span> <span word="duty">duty</span> / <span word="an">an</span> <span word="honor">honor</span> / <span word="a">a</span> <span word="shame">shame</span> / <span word="a">a</span> <span word="crime">crime</span> / <span word="no">no</span> <span word="easy">easy</span> <span word="job">job</span> <span word="to">to</span> <span word="do">do</span></p><p> <span word="It">It</span> <span word="takes">takes</span> (<span word="sb">sb</span>.) <span word="some">some</span> <span word="time">time</span> / <span word="courage">courage</span> / <span word="patience">patience</span> <span word="to">to</span> <span word="do">do</span></p><p> ? <span word="It">It</span> <span word="requires">requires</span> <span word="courage">courage</span> / <span word="patience">patience</span> / <span word="hard">hard</span> <span word="work">work</span> <span word="to">to</span> <span word="do">do</span></p><p> *注意: <span word="probable">probable</span> 和 <span word="possible">possible</span> 均可作表语，但<span word="possible">possible</span>可以用不定式作真实主语， 而<span word="probable">probable</span>不能用不定式作真实主语。</p>
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